方法用双胎母绵羊，每胎其中一只胎羊在母羊妊娠中期切除甲状腺。

Method During mid pregnancy of the female sheep with twins, one fetus of the twins was thyroidectomized.

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方法用双胎母绵羊，每胎其中一只胎羊在母羊妊娠中期切除甲状腺。

Method During mid pregnancy of the female sheep with twins, one fetus of the twins was thyroidectomized.

youdao