Forced cooling air should be used from the beginning of the furnace campaign.

在窑炉作业期开始时就要用空气强制冷却.

辞典例句

Baked version must be cooled down, not forced cooling, so as not to make aluminum base.

烤版后必不退给板滞加热, 不给被迫加热, 以免使铝版基变形.

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