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井下作业
jǐngxià zuòyè
stresses
dril.
работа в скважине
geophys.
скважинные работы
mining.
подземные работы
tech.
работы в скважине
;
подземная работа
井 下 作业
:
2 phrases
in 2 subjects
General
1
Oilfields
1
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