下降英文简写

U,D,L,Rup,down,left.right

上up-u，下-down-d，左-left-l，右-right-r，前-front-f，后-back-b

上升沿就是UP，简写为P；下降沿就是DOWN，简写为N

上up-u，下-down-d  左-left-l，右-right-r

1、up 读音：英 [ʌp]   美 [ʌp]

adv.在上面，在高处;起床，起来;向上;由低到高

adj.向上的;上升的;竖立的，垂直的;举起的

vt.& vi.增加;加速;提高;举起，拿起

prep.在…的上端;向高处;沿…而去;向…上游

n.上升，升高;兴旺，繁荣;上坡;（价格等）上涨

第三人称单数： ups 现在分词： upping 过去式： upped 过去分词： upped

2、down 读音：英 [daʊn]   美 [daʊn]

adv.向下;（坐、倒、躺）下;（表示范围或顺序的限度）下至

prep.（从高处）向下;（表示位置）在…的下方;（表示方向）沿着…向下;（表示时间）自…以来

adj.向下的;沮丧的;计算机或计算机系统停机;（以…）落后于对手的

n.（鸟的）绒羽;绒毛;软毛;汗毛

vt.放下;（尤指大口或快速地）喝下;使摔倒;击落（敌机等）

vi.下来;下降;[常用于祈使句中]下去;卧倒

第三人称单数： downs 复数： downs 现在分词： downing 过去式： downed 过去分词： downed

3、left  读音：英 [left]   美 [lɛft]

adj.左边的，左侧的;左派的

n.左，左面;[军]左翼;左派，激进分子

adv.向左;在左边

v.离开( leave的过去式和过去分词)

复数： lefts

4、right  读音：英 [raɪt]   美 [raɪt]

adv.立刻，马上;向右，右边;恰当地;一直

adj.正确的;合适的;右方的;好的，正常的

n.权利;右边;正确，正当;右手

vt.纠正;扶直，使正;整理;补偿

vi.（船舶等）复正，恢复平稳

第三人称单数： rights 复数： rights 现在分词： righting 过去式： righted 过去分词： righted

扩展资料：

前-front-f，后-back-b

一、front 读音：英 [frʌnt]   美 [frʌnt]

n.前面;正面;前线;身体前部  adj.前面的;正面的;舌前的 v.面向;在…前面;用…作正面;领导

第三人称单数： fronts 复数： fronts 现在分词： fronting 过去式： fronted 过去分词： fronted

例句：

1、One man sat in an armchair, and the other sat on the front of the desk

一个男人坐在扶手椅里，另一个坐在桌子前面。

2、Attractive gardens fronted the houses.

这些房子的前面都有漂亮的花园

二、back 读音：英 [bæk]   美 [bæk]

n.背，背部;背面，反面;后面，后部;（椅子等的）靠背

vt.使后退;支持;加背书于;下赌注于  vi.后退;倒退

adj.后面的;背部的;以前的;拖欠的  adv.以前;向后地

第三人称单数： backs 复数： backs 现在分词： backing 过去式： backed 过去分词： backed

例句：

1、We could only get seats at the back (= of the room) .

我们只能找到后排的座位。

2、Slacken your legs and slowly lie back.

放松双腿, 慢慢向后躺下。

acc = account, accountant acdg = according acpt = accept ad = advertisement adm = administration ads = address adv = advice agr = agriculture agt = agent alt = altitude a.m. = ante meridiem = before noon AMAP = as much as possible amb = ambassador amt = amount anal = analysis arch = architecture anc = ancient anon = anonymous ans = answer app = appendix Apr = April apt = apartment ave = avenue a.w.l. = absent with leave (准假) a.w.o.l. = absent without official leave (无故缺席) B.A. = Bachelor of Arts bal = balance B.C. = before Christ bd = board bdl = bundle bk = bank; book bkts = baskets B/L = bill of lading (提单) BLDG = building bp = birthplace br = branch; brother B.S. = Bachelor of Science bu = bureau C = capacity; century; chapter; centigrade; cost; city; center cal = calendar; caliber; calories cap = capital; captain cat = catalog cc = carbon copy (复印件；抄送) CEO = chief executive officer cert = certificate CFM = confirm cncl = cancel cp. = compare cit = citizen civ = civil; civilization clk = clerk cml = commercial co. = company c/o = care of(转交) col = college; color com = commentary; common; communication; community comm = commission comp = complete; computer; competition con = conclusion; against cond = condition cont. = continent; continued corp = corporation cust = customer; custom; customs Dec = December dec = deceased; declaration def = defender; defense deg = degree dep = deposit DEPT = department disc = discount dist = distance; distinguish div = divide; divorced do. = ditto (同上） dorm = dormitory dpt = departure dz = dozen e = east; earth; engineering econ = economics; economy ed. = education; editor e.g. = exempli gratia = for example encl. = enclosed; enclosure esp. = especially arr = arrive; arrival ASAP = as soon as possible ass = assistant; association at = atmosphere; atomic att = attorney; attention Aug = August aux = auxiliary av = average etc. = et cetera = and so on ex. = example; exception; extra exp. = export expln = explain ext = extend; extension FAX = facsimile Feb. = February fem = female; feminine ff. = following fig = figures fin = finance; financial fl = fluid FLT = flight FOB = free on board (船上交货；离岸价格) for = foreign; forestry fp = freezing point fr = frequent Fri. = Friday frt = freight (货物；货运) ft = foot; feet (脚；英寸) fut = future FYR = for your reference (仅供参考) g = gold; grain; guide; gender; gravity G.A. = General Assembly (联合国大会) gen. = generally gent = gentleman; gentlemen gm = gram; general manager gov = government gs = general secretary (秘书长) h = harbor; hundred; husband; hydrogen hd = head (头部；首脑) ht = height hypoth = hypothesis; hypothetical i.a. = in absence; absent ib. = ibidem = in the same place ID = identity; identity card i.e. = id est = that is imp = import; imperial IMPS = impossible IMPT = important in. = inch; inches ind = industrial; independent indiv = individual info = information ins = insurance inst. = instant; institute int. = interior; interest (兴趣；利息) I/O = instead of IOU = I owe you (借据) I.Q. = intelligence quotient IVO = in view of (鉴于,考虑到) is. = island J = judge; justice jour = journal; journalist jr. = junior (大学三年级学生; 年少的; 初级的) kg = kilogram (千克；公斤) km = kilometer (公里) lat. = latitude lb. = pounds (磅；英镑) L/C = letter of credit (信用证) leg = legal lib = library; librarian liq = liquid lit = literature long. = longitude M.A. = Master of Arts mach = machinery mag = magazine man. = manual; manufacture Mar = March math = mathematics MDL = model (型号；模特) Mdm = Madam med. = medicine; medical mem = member; memoir (回忆录) hf = half Hon = honorable; honorary H.Q. = headquarters hr = hour MDL = model (型号；模特) Mdm = Madam med. = medicine; medical mem = member; memoir (回忆录) memo = memorandum (备忘录) mid = middle min = minute; minimum mkt. = market mod = moderate; modern Mon. = Monday mph = mile per hour (每小时英里数; 车速) Mr. = Mister Mrs. = Mistress MS = manuscripts (手稿) msg = message Mt = Mount; mountain mus = music; museum n = north; noon; name; normal nat = national; native; natural n.d. = no date (无日期) NLT = not later than (不迟于) No. = number Nov. = November nr = near obj = object; objective obs = obsolete (过时的); observe obt = obtain Oct. = October off. = office; official op. = opera; operation; opposite ord = ordinary org = organization orig = original oz. = ounce (盎司) p. = page; power; pressure para = paragraph part = particular; partner pass = passive; passenger PAT = patent payt = payment pc = piece; personal computer pd. = paid (钱款)已付 perf = perform; performance Ph.D. = Doctor of Philosophy pk = park; peak (备注：pk这个符号大家可以根据时髦的用语来灵活拓展其含义) pkg = package PLS = please p.m. = post meridiem = [w]afternoon POB = post-office box pop = popular; population pr. = pair; preferred prec = preceding prim = primary; primitive prin. = principle pro = product Prof. = professor pub. = public; publish qr. = quarter qt. = quantity qua = quality r. = radius; railroad; retired rcd = received rcpt = receipt Rd = road re = about (关于) reg = register; region rep = representative rev = revise; reverse; revenue riv = river rm. = room rpt = report; repeat Sat. = Saturday sch = school sci = science sec = second; section; sector sig. = signal; signature sitn = situation sp. = species (物种); specimen (标本) sq. = square STD = standard Sun. = Sunday surg = surgery; surgeon tech = technology tel. = telephone temp = temporary; temperature Thur. = Thursday TKS = thanks trans = transaction; translation trf = traffic ttl = total Tu. = Tuesday T.U. = Trade Union (英)工会 ult = ultimate UN = United Nations univ = university up = upper usu. = usually vil = village V.P. = Vice President vs. = versus v.v. = vice versa (反之亦然) wel = welcome; welfare XL = extra large (特大号)