名词
中文翻译：跨胎盘的
同义词：
['transplacental', 'placenta-transplacental']
例句：
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1. The fetus's growth is closely monitored during the transplacental period.
胎儿在胎盘期的生长受到密切监测。
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2. Transplacental transfer of genetic material has been shown to be more efficient than intrauterine transfer.
研究表明，胎盘间转移遗传物质的效率比宫内转移要高。
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3. The transplacental transmission of viruses has raised concerns about the safety of vaccines.
病毒通过胎盘传播引发了对疫苗安全性的担忧。