for：
prep.对于;为了;(表示对象、用途等)给，对，供;以帮助;关于
conj.因为;由于
例句：
There was much discussion about the reasons for the failure.
就失败的原因进行了大量的讨论。
We have a full order book for the coming year.
我们来年的.订货簿已经记满了。
I didn't get a red cent for all my work.
我做了那么多工作，可什么也没得到。
We're going to Germany for Christmas and New Year.
我们要去德国过圣诞和新年。
A good dictionary is indispensable for learning a foreign language.
一本好词典是学习外语必备的。
The book will be invaluable for students in higher education.
这本书对于高校学生将有重大价值。
Respect for life is a cardinal principle of English law.
尊重生命是英国法律最重要的原则。