- 中空: cavity; medium altitude
- 子弹: cartridge; bullet; ammunitio ...
- 中空子: hollow point bullet
- 空子: 空子[物理学] (positive) hole; hole carrier
- 中空: cavity; medium altitude◇中空玻璃 double glazing; 中空纤维 doughnut; 中空轴 quill shaft
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