The father was present at the (moment of) birth.

婴儿出生时其父亲在场。

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At the moment, the majority of cloned mice, sheep and other animals die before birth.

这时，大多数克隆鼠、羊和其他动物都在出生前死掉了。

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At the moment, the majority of cloned mice, sheep and other animals die before birth.

这时，大多数克隆鼠、羊和其他动物都在出生前死掉了。

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