筛的用法和样例：
例句
-
我们得把申请书仔细筛选一下以甄别优劣。
We have to sift through the application forms very carefully to separate the wheat from the chaff. -
我们可以用一个筛子把石头分离出来。
We can separate the stones out with a sieve. -
她正在把米过筛，好把石头筛出。
She is sieving the rice in order to sieve out the stones. -
做蛋糕前先把面粉筛一下。
Sift the flour before making the cake.
