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直接观察 zhíjiē guānchá
avia. direct-vision (窗); direct vision
met. direct observation; immediate observation
space direct-vision
直接观察测量 zhíjiē guānchá
auto. direct observation
直接 观 察: 13 phrases in 8 subjects
Automobiles2
Aviation1
Economy1
Genetics1
Metallurgy1
Oil / petroleum2
Technology4
United Nations1