将面粉和发酵粉筛入中等大小的搅拌碗中。Sift the flour and baking powder into a medium-sized mixing bowl.所献血液一律要经过人体免疫缺陷病毒的筛查。All donated blood is screened for HIV.把面粉筛到碗里。Sift the flour into a bowl....

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“筛”的拼音为：shāi...