... operating floor 操作台 operating fluid level 工作液面 operating fluid 工作液 ...
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operating fluid level
工作液面
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Filling them properly involves putting the fluid in, getting it up to operating temperature, then draining to get the level just right.
WSJ: By JONATHAN WELSH
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