名词
中文翻译：Unknown
同义词：
['embryonicstage', 'embryonic period', 'fetalperiod']
例句：
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1. Thestudy of the fetal stage is crucialfor understanding human development.
研究胎儿阶段对于理解人类发展至关重要。
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2. During the fetalstage, the baby's brain isdeveloping rapidly.
在胎儿阶段，婴儿的大脑正在迅速发育。
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3. Thefetal stage is acritical period for the growth anddevelopment of the fetus.
胎儿阶段是胎儿生长和发育的关键时期。