柯林斯词典air brake (air brakes) 1. N-COUNT Air brakes are brakes that are used on heavy vehicles such as buses and trains and that are operated by means of compressed air. 气闸; 空气制动器 返回 air brake剑桥词典a brake operated by air pressure , used on large vehicles such as buses and trains （公共汽车、火车等的）气闸，空气制动器 返回 air brake