dear prof. wang,

　　i m writing to ask you to excuse me for not being able to keep our appointment. i do know that this is very impolite and must have caused you much trouble.

　　i do reckon that at present any explanation is pale and futile. however i do not want you to misunderstand me. on my way to your office, an old lady suddenly fainted due to heart attack on the bus. i stopped a taxi and sent her into a nearby hospital. i stayed there until her son came, which spoiled our appointment.

　　i am aware that our appointment is of importance. i do hope that you would be kind enough to spare your valuable to meet me.

　　i am looking forward to hearing from you.

　　sincerely yours

　　亲爱的王教授，

　　我写信请求你原谅我的失约。我知道，这是非常不礼貌的，一定会给你造成麻烦。

　　我认为目前任何解释是徒劳的。但是我不想你误解我的意思。在我去你办公室，一个老太太突然晕倒了，由于车上的心脏病。我拦了一辆出租车，送她到附近的医院。我呆在那里，直到她儿子来，把我们的约会。

　　我知道我们的约会是很重要的。我真的希望你能抽出你宝贵的迎接我。

　　我期待着你的来信。

　　你真诚的