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。