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to phrases
principal plane
auto.
主
平
面
chem.
主面
earth.sc.
主割面
;
物像平面
rem.sens.
主平面
principal plane:
47 phrases
in 9 subjects
Air defense
2
Architecture
1
Bridge construction
2
Chemistry
1
Engineering geology
9
Hydroelectric power stations
3
Oil / petroleum
1
Space
5
Technology
23
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