n.筛；过滤
动词sift的现在分词形式.
They are sifting the wheat from the chaff. 他们正往外筛麦壳子。
He lay on the beach, sifting the sand through his fingers. 他躺在沙滩上用手筛砂子玩。
Mine sieving mesh is a kind of metal mesh components for sifting and filtering. 矿筛网是一种用于筛分过滤的金属网状结构元件。
