| 单词 | 孔口 |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔blockhouse〕A military fortification constructed of sturdy material, such as concrete, and designed with ports for defensive firing or observation.碉堡：用混凝土等坚固的物质构筑起的军事防御工事，而且设有用于防御时射击或观察的孔口美国传统〔lubber's hole〕A hole through the platform surrounding the upper part of a ship's mast, through which one may climb to go aloft.桅斗入孔口，桅楼升降口：船的桅杆上部，穿过周围平台的孔，供住更高处去的人通过美国传统 |
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