for：

　　prep.對于;為了;(表示對象、用途等)給，對，供;以幫助;關于

　　conj.因為;由于

　　例句：

　　There was much discussion about the reasons for the failure.

　　就失敗的原因進行了大量的討論。

　　We have a full order book for the coming year.

　　我們來年的訂貨簿已經記滿了。

　　I didn't get a red cent for all my work.

　　我做了那么多工作，可什么也沒得到。

　　We're going to Germany for Christmas and New Year.

　　我們要去德國過圣誕和新年。

　　A good dictionary is indispensable for learning a foreign language.

　　一本好詞典是學習外語必備的。

　　The book will be invaluable for students in higher education.

　　這本書對于高校學生將有重大價值。

　　Respect for life is a cardinal principle of English law.

　　尊重生命是英國法律最重要的原則。