The pump exhaust should lead to the open air or a fume hood.
抽气泵的排气管应该导向室外空旷处或导向一座通风橱。
Work in areas about the size of a car door or half the hood.
对工作区的大小的汽车门或半区。
The top ends of the four rods can support a hood or a canopy.
四个杆的顶端可撑起一个篷或帐。
The top ends of the four rods can support a hood or a canopy.
四个杆的顶端可撑起一个篷或帐。
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