They are different. Pan is like "潘" but pen is like "盆". There is no difference between British English and American English in this two sounds.An is like Chinese word "按", while en is like "恩".
pan1名词 n. [C]1. 平底锅He cooked the pasta in a large pan of boiling water. 他用一大锅开水煮意大利面食。 2. 秤盘 3. 选矿锅 4. 盆地,洼地 5. 【俚】脸及物动词 vt. 1. (用选矿锅)淘洗;(用选矿锅)淘(砂金等)[(+off/out)] 2. 【口】严厉地批评That movie was panned by the critics but loved by the public. 那部电影被影评人批评得一文不值,但是却颇受大众喜欢。 The newspaper article panned the politician. 报上那篇文章严厉地批评了那个政客。 3. (用平底锅)烧(菜)不及物动词 vi. 1. (用选矿锅)淘金[(+for)] 2. 出金,产金[Q]The gravel pans well. 那砂砾产金量高。 pan2不及物动词 vi. 1. 摇镜头;摇摄The camera panned slowly across to the lady sitting in the corner. 镜头慢慢转向坐在角落里的那位贵妇人。 及物动词 vt. 1. 使(摄影机)摇摄He panned the camera across the scene. 他摇镜头拍摄全景。 pan3名词 n. 1. 槟榔叶 2. (由槟榔叶等制成的)提神咀嚼物
第一:pan [pæn]pen [pen][e]时舌尖抵下齿,舌前部稍抬起。嘴不要张太大,上下齿间距离宁可偏小。如 bed ten 发[æ]时,舌尖抵下齿,舌前部稍抬起。嘴要张开、张大,而且尽量放宽,刚开始练习时可以夸张一点。第二:英语音标中没有这几个,这些是是几个音标组合在一起的/a/不存在/n/舌尖伸出来一些,上下牙抵着伸出舌头,发字母N的后面一个音/e/嘴巴稍微张开