它们头上有一个气孔，就像人的鼻孔一样。
They have one blowhole on top of their head, it's like a human's nostrils.
第一端盖位于套管的第一端附近，其中第一端盖包括至少一个气孔。
A first end cap is located adjacent the first end of the tube, wherein the first end cap comprises at least one air hole.
第一空气通道从至少一个气孔延伸至第一风扇并在至少一个气孔处出来，其中第一空气通道接触马达。
A first air path extends from the at least one air hole to the first fan and exits at least one air hole, wherein the first air path contacts the motor.
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