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infancy
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infancy
婴儿期
个体从出生到3岁的时期。这一时期通常又分为两个阶段,即0~1岁阶段和1~3岁阶段。有的研究者分别称之为乳儿期和婴儿期。
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safety of stamping machinery
safety of transgenic medicinal resourses
safety of wood planer
safety of woodworking machinery
safety operation of civil engineering system
safety operation of crane
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safety production responsibility system
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