headroom
n. 净空；净空高度；头上空间
例句
There's a lot of headroom for such a small car.
这么小的一辆汽车的头上空间蛮大的。
《牛津词典》
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。
《柯林斯英汉双解大词典》
Countries now have some headroom to borrow.
这些国家目前有一些借款的余地。
