名词短语中文翻译
中文翻译：在胎盘前置的血管中
同义词：
['pre-existing', 'existing', 'prior', 'antecedent']
例句：
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1. The patient's conditionworsened significantly after the surgery.
手术后，患者的病情显著恶化。
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2. The researcher found thatthe data was pre-existing beforethe experiment began.
研究者发现，在实验开始之前，数据就已经存在了。
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3. The decision tobuild a new bridge was made priorto the construction of the old one.
建造新桥的决定是在旧桥建成之前做出的。