menace可以作动词,而threat没有动词意思,只能用threaten作动词;另外threat作名词还有凶兆;征兆的意思!具体的解释如下:threatn.1.威胁,恐吓[C][U][+to-v]2.构成威胁的人(或事物)[S][(+to)]Some people think that machinery is a threat to their jobs.一些人认为机器是对他们工作的一种威胁.3.凶兆;征兆[S][(+of)]The clouds brought a threat of rain.阴云带来要下雨的征兆.menacen.1.威胁,恐吓[C][U][(+to)]He spoke with menace in his voice.他说话的声音中带着威胁.2.威胁性的言行;具有危害性的人(或物)[C]These local conflicts may constitute a menace to world peace.这些地方性的冲突有可能对世界和平构成威胁.3.【口】极端讨厌的人(或物)[C]You're a menace!你这人真讨厌!vt.1.威胁,恐吓;危及The robber menaced him with a revolver.强盗用左轮手枪威吓他.vi.1.进行威胁,进行恐吓