Proper functioning of the device’s fans is vital for proper operation.

设备风扇的正常运转对设备的正常运行至关重要。

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An adjustment of airplane controls and doors for proper operation.

使飞机操纵系统和舱门能正常工作而做的装配调整。

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The specific material selected for a particular tool is normally determined by the mechanical properties necessary for proper operation of the tool.

为某一工具选择特有的材料，通常由该工具在正确的操作下所需的机械性质决定。

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The DOT issued a proposed compliance order directing Exxon to conduct training for supervisors and pipeline control room workers, including on the proper operation of remote control valves.

NPR: APNewsBreak: $1.7M Penalty Proposed In Exxon Spill

At some point on his road back, Campbell learned of the Troops First Foundation and Operation Proper Exit, charities that provide opportunities for severely injured service members to return to the locations where they sustained their injuries and, instead of being medically evacuated, provide them the opportunity to walk to the aircraft and climb the ramp.

FORBES: Former Marine Betrays Semper Fi In PGA Scam