The fin-like appendage on the helmet houses a forced ventilation fan, which blows freshair 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。
2
He suggested having a ceiling electric fan installed in the room. This would solve the problem of ventilating the room, for when the fan whirled, it would draw in freshair.
他建议安装一台吊顶电风扇。这将解决房间通风问题，因为当风扇急速转动时，它将带进新鲜的空气。
3
This would solve the problem of ventilating the room, for when the fan whirled, it would draw in freshair.