词汇与表达：sieve-sift

sieve
A sieve is a tool used for separating solids from liquids or larger pieces of something from smaller pieces. It consists of a metal or plastic ring with a wire or plastic net underneath, which the liquid or smaller pieces pass through.
Empty the contents of the pan into the sieve
将锅里的东西倒到筛子上。

sift
If you sift a powder such as flour or sand, you put it through a sieve in order to remove large pieces or lumps.
Sift the flour and baking powder into a medium-sized mixing bowl.
将面粉和发酵粉筛入中等大小的搅拌碗中。
If you sift through something such as evidence, you examine it thoroughly.
Police officers have continued to sift through the wreckage following yesterday's bomb attack...
警察继续仔细检查昨天炸弹袭击后留下的残骸。