它的功能和真正的心瓣膜差不多，能够预先判断出血流方向并作出相应的反应。
It would operate more like a real heart valve that anticipates what the blood flow is going to be and ACTS accordingly.
颅底异位脑膜瘤较硬脑膜内者血运差，手术中出血量不多，一般不需动脉结扎或动脉栓塞。
The ectopic meningioma on skull base has less blood supply than intradural meningioma, and less hemorrhage, so the artery does not need to be ligated or embolized during the operation.
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