A baby usually is protected from many diseases for a short time after birth by an immunity inherited from his mother.
婴儿继承母亲的免疫力,出生后不长的一段时间人通常受到保护,不受多种疾病的侵袭。
A baby usually is protected from many diseases for a short time after birth by an immunity inherited from his mother.
婴儿继承母亲的免疫力,出生后不长的一段时间人通常受到保护,不受多种疾病的侵袭。
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