The fin-like appendage on the helmet houses a forced ventilation fan, which blows fresh air over the technician's face to relieve perspiration.
头盔装具上的鳍状物附属物为强制通风片，能够向拆弹专家的面部输送新鲜空气以便排除汗水。
Forced ventilation should be provided when applying paint in confined Spaces or stagnant air.
在狭窄处或空气不流通处施工，必须提供强力通风。
Racks of tobacco are placed in bulk barns where heat and ventilation are controlled while air is forced through the leaves.
烟草架安放在大仓中，那里热量和空气是受控而使空气强行通过烟叶。
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