vertical space available to allow easy passage under something
同义词：headway, clearance
the capacity of a system to reproduce loud sounds without distortion
同义词：dynamic headroom
headroom例句
There is not enough headroom for buses to go under this bridge.
这座桥梁下面的净空高度不够，公共汽车不能通行。
headroom详细解释
head.room n.（名词）Space above one`s head, as in a motor vehicle, above a doorway, or in a tunnel; clearance.净空高度：如在机动车内、门上方或隧道中的某人头部上端的空间；空间Electronics Dynamic headroom.【电子学】 能活动的空间
