| 单词 | porthole | 
| 释义 | Word Frequency porthole(ˈpɔːtˌhəʊl) noun 1.  a small aperture in the side of a vessel to admit light and air, usually fitted with a watertight glass or metal cover, or bothSometimes shortened to: port 2.  an opening in a wall or parapet through which a gun can be fired; embrasure  | 
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