the sifting of sth
用于表示“筛某物”这一动作，of 后面接被筛的物质。
The sifting of the flour removes any lumps.
把面粉过筛可以去除结块。
过筛；筛选
siftings — plural of sifting
筛下物；筛屑；筛分某物的行为。；通过筛子的物料。；筛；过滤
the act of sifting something
筛分某物的行为。
The act by which something is sifted.
通过筛子的物料。
The material which falls through a sieve.
The sifting of the flour took longer than I expected.
筛面粉的时间比我预期的要长。
用法提示：sifting 是名词，表示“过筛”这一动作。
After the sifting, the fine powder was ready for baking.
过筛之后，细粉就可以用来烘焙了。
用法提示：这里的 sifting 指“过筛”这件事。
The baker collected the siftings from the sieve and used them in the cake.
面包师收集筛下的细粉，用它们来做蛋糕。
用法提示：siftings 是名词复数形式，指筛下的细粉。
用于表示“筛某物”这一动作，of 后面接被筛的物质。
The sifting of the flour removes any lumps.
把面粉过筛可以去除结块。
口语中常用 give...a sifting 表示“把某物筛一下”，动作短暂而具体。
Give the sugar a quick sifting before you mix it in.
把糖拌进去之前，先快速过一遍筛。
复数 siftings 指筛下去的那部分物料，常与 from 连用说明来源。
The siftings from the sieve were thrown away.
从筛子里筛下来的细料被丢掉了。
grammar · medium
易错句子The sifting the flour took a long time.
正确表达The sifting of the flour took a long time.
名词 sifting 后接动作对象时要用 of 引出受事，不能像汉语“筛面粉”那样直接跟宾语；加上 of 后，the sifting of the flour 才是一个合法的名词短语。
grammar · medium
易错句子We did many sifting before baking the cake.
正确表达We did a lot of sifting before baking the cake.
这里泛指“筛分”这一过程，sifting 作不可数名词，不能用 many 修饰；many 只修饰可数复数，故用 a lot of 来修饰不可数的 sifting。
sifting 只表示“过筛”这一动作或筛下的物料；shifting 来自 shift，指位置移动，或立场、风向、形势的转变。两者拼写只差一个字母、读音接近，但意思完全不同，不能互换。
两者都指用筛子分离，很多语境下可以互换；但 sieving 更常用于厨房或工业中按颗粒大小分离固体（筛沙、筛谷物），sifting 更常指筛面粉等细粉，也常引申为筛选信息。这只是常见倾向，并非绝对规则。
filtering 强调让液体或气体通过滤材除去杂质，也可指筛选信息；sifting 强调用筛子按颗粒大小分离干燥的固体，一般不用于液体。要表达“筛面粉、筛沙子”用 sifting，表达“过滤水、过滤空气”用 filtering。
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