head·room /ˈhɛdˌrum, ˌrʊm/
淨空,頭上空間
Head·room n. Arch. See Headway, 2. [Mostly Brit.]
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headroom
n 1: vertical space available to allow easy passage under
something [syn: headway, clearance]
2: the capacity of a system to reproduce loud sounds without
distortion [syn: dynamic headroom]