We have to sift through the application forms very carefully to separate the wheat from the chaff.
我们得把申请书仔细筛选一下以甄别优劣.
This old man is a leading authority on wheat diseases.
这位老人是小麦病虫害方面的权威。
This machine crushes wheat grain to make flour.
这台机器把麦子磨成面粉。