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to phrases
operations hours
avia.
运行小时
;
操作小时
operation hours
dril.
运转时间
;
作业时数
oil
操作时数
operations hours
:
10 phrases
in 8 subjects
Automobiles
1
Business
2
Explosives and Explosive Ordnance Disposal
1
General
1
Mining
1
Space
1
Technology
1
Telecommunications
2
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