边界定义
rounding file───[机]圆锉;废纸篓
sounding line───测深索
sounding machine───测深机;测深仪;触探机
rounding down───舍入
sounding lines───声频通信线中路
sounding machines───测深机
bouncing Bess───弹跳贝丝
bouncing Bet───肥皂草
boundary line───边界线;疆界线