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access | |||
access hole; access port | |||
manhole | |||
entrance hole; sewer manhole | |||
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manhole; entrance hole; access opening | |||
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hatch |
进 人 孔 : 20 phrases in 6 subjects |
Architecture | 2 |
Aviation | 1 |
Construction | 1 |
Hydroelectric power stations | 8 |
Refrigeration | 1 |
Technology | 7 |