We often shake flour through a sieve.
我们经常用筛子筛面粉。
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样思考(视频版) Between these tentacle-like projections are tiny gaps called filtration slits that act like a sieve allowing only small particles such as water, glucose and ionic salts to pass through while blocking large proteins and red blood cells.
在这些触手状
突出物之间有微小
缝隙,称为滤孔;像
子
样只允许小分子物质如水、葡萄糖、盐等通过,而阻挡大分子蛋白质、红细胞等。
房