If you sift a powder such as flour or sand, you put it through a sieve in order to remove large pieces or lumps.
例句
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。
VERB
细查;详审
If you sift through something such as evidence, you examine it thoroughly.
例句
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。Brook has sifted the evidence and summarises it clearly.布鲁克已经仔细审查过证据并将其总结得一清二楚。