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to phrases
principle of operation
busin.
经营原理
hydroel.st.
操作原理
microel.
工作〔操作〕原理
refrig.
运行原理
space
作战原则
;
工作原理
tech.
运转原理
principle
s
of operation
telecom.
工作原理
;
操作原理
principle of operation:
2 phrases
in 2 subjects
Business
1
Economy
1
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