- safe overhead clearance
- 安全: safe; secure; safety; securi ...
- 净空高度: head room
- 安全净空: safe clearance
- 净空高度: clearance height; free height; head room; head-room (overhead) clearance; headroom; headway; height of clearance; overhead clearance
- 通行高度；净空；净空高度: headroom
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