一胎一胎[yī tāi]1.■a birth常用词组1.■一胎六儿 sextuplets;2.■一胎率 the one-child ratio;3.■一胎七儿 septuplets;4.■一胎三儿 triplet;5.■一胎四儿 quadruplets;6.■一胎五儿 quintuplets
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