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direct-vision (窗); direct vision | |||
direct observation; immediate observation | |||
direct-vision | |||
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direct observation |
直接观察 : 13 phrases in 8 subjects |
Automobiles | 2 |
Aviation | 1 |
Economy | 1 |
Genetics | 1 |
Metallurgy | 1 |
Oil / petroleum | 2 |
Technology | 4 |
United Nations | 1 |