名词
中文翻译：前体
同义词：
['antepartum', 'antenatal', 'progestagen']
例句：
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1.The pregena of the embryo is crucial for its development.
胚胎的前体对其发育至关重要。
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2. The pregena of the fetus contains all the cells that will form the body.
胎儿的前体包含所有将形成身体细胞。
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3. Pregena therapy has been shown to improve fertility in some cases.
一些情况下，前体疗法已被证明可以提高生育能力。