What kinds of air return should be used depend on standard of clean room.

回风形式还需依净化室的标准级别来决定。

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Measures the clean class for a practical engineering adopting air return from corridor, and the results show that the mode is feasible.

对采用走廊回风的实际工程进行了洁净度检测，结果表明走廊回风是可行的。

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The importance for the mine to strengthen the maintenance of the air return way and the points needing attention in designing and allocating the ventilation shaft are pointed out.

同时提出生产矿山加强回风道维护的重要性，以及在设计和布置通风井时应注意的问题。

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He also announced that two Turkish military air ambulances had been sent to Israel to help return the wounded.

VOA: standard.2010.06.01

Earlier this week, RIM said it fired two employees who a Canadian court fined the week before for disrupting a Toronto-to-Beijing flight, causing it to turn around after hours in the air and return to Canada.

WSJ: RIM Drops BBX Name After Copyright Spat

Witnesses said the blast was triggered by neighborhood residents firing gunshots into the air celebrating the return of electricity to the area.

CNN: Bush calls end to 'major combat'

Uganda FA President Dennis Obua said Egypt had offered to pay for the teams' return air-tickets, accommodation and meals, but that they were now back-tracking.

BBC: Zone 5 qualifiers in chaos