clearances间隙clearancen.清除；清理；清仓甩卖；间隙；许可证；结关；通关clearance gage method隙规检查法Clearance Diving Team潜水障碍清除队clearance of retarder减速器接近限界clearance testing car净空检查车clearance certificate放行证书; 结关单clearance restriction建筑接近限制,净空限制clearance of the bank银行兑换clearance limit frame限界框clearance of assembly装配间隙clearance convergence净空收敛