A check valve is a mechanical valve that only permits water flow in one direction.
检查阀(单向阀)是一个手动阀门，这样水只能往一个方向走。
The hypercoagulable state poses an extra problem in women with a mechanical valve prosthesis.
高凝状态给机械瓣膜妇女带来了麻烦。
In the ZAHARA study, mechanical valve prosthesis predicted both maternal and neonatal complications.
ZAHARA研究中，机械瓣对产妇和新生儿并发症均有预测价值。
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