The only way for air to go inside HDA is through the breathing hole.
唯一的途径空气进去HDA的是通过呼吸孔。
A polar bear may sit for hours at a breathing hole, waiting for a seal to surface.
一头北极熊会在呼吸口边坐上数个小时等待海豹出来换气。
A Weddell seal mother and pup with their breathing hole, which must be kept continuously open.
一只威德尔海豹(Weddell seal)母亲和她的幼崽待在透气孔边上,透气孔必须得始终保持通畅。
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