| 单词 | blowhole | 
| 释义 | blowholenoun  blow·hole  ˈblō-ˌhōl     plural blowholes   1   : a hole in metal caused by a bubble of gas captured during solidification   2   : a nostril in the top of the head of a cetacean and especially a whale   3   : a hole or fissure in rocks along a shore through which incoming waves force air to rush upward or water to spout intermittently  The blowhole is in a place where ocean waves marching in from the north have undercut a lava shelf and carved a tire-sized hole so that surf can spout up like a Yellowstone geyser. | 
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