Power Headroom功率余量
Headroom Hmin两钩间最小距离
Cabin Headroom舱室高度
standup headroom座舱内站立时头上空间
Headroom glide高空滑翔
dynamic headroom动态净空
Max Headroom限高;超级麦克斯;双面麦斯;麦克斯海德鲁姆
well headroom井道顶部
N-UNCOUNT（不可数名词） Headroom is the amount of space below a roof or bridge. (屋顶或桥下的)净空
The forecabin, with 6ft headroom, also has plenty of room to stand and get dressed.
有6英尺净空的前舱也有足够大的空间供人站立和穿衣。