... downcut下部掏槽 downdraft下向通风 downhole向下炮眼 ...
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... downward mining 下行开采 downward ventiline 下向通风 downward working 下行开采 ...
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短语
下向通风筒
downward ventilator
向下通风
downdraft
;
down draught
-
downdraft
downward ventilation
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