净空

jìngkōng

clearance

* * *

headroom

【化】 clear space

* * *

headroom

* * *

jìng kōng

n. clearance, headroom

jìng kōng

n. clearance, headroom

* * *

净空

jìng kōng

headroom; freeboard; clearance

净空高度（拱梁等下面） head room;

净空损失 clearance loss