... required torque；需要的扭矩 required ventilation；需要的通风 requirement；需要，要求 ...
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required ventilation
需要通风
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Six of them were admitted to the intensive care unit and four required mechanical ventilation.
CNN: 'We are not out of the woods' with new flu, CDC warns
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