Then needs two times the surgery, opened the block system paranasal sinus.
则需二次手术，重新开放闭锁了的鼻窦。
They can block air passages or sinus channels to cause a variety of grief.
它们能阻塞气道或鼻窦的通道，造成各种痛苦。
Experimental study on carotid sinus and vagus during cervical plexus block
颈神经丛阻滞麻醉致颈动脉窦和迷走神经阻滞的实验研究
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