W-3:weed out (get rid of, select) 挑选
A:You should weed out good guys from the had when making friends in school.
A：在学校交朋友的时候，你应该从坏孩子中挑出那些好孩子来。
B:But I can't tell the difference between them.
B：但是我分不清哪些是好人，哪些是坏人。
A:It must take you some time to know a person well. But you should remember a friend in need is a friend indeed.
A:要了解一个人的为人是要花时间的，但你必须记住患难朋友才是真正的朋友。
