基板罗盘

beam compass───长臂圆规；[计量]横杆圆规

astrocompass───天文罗盘

baseline cost───基本费用

baseline costs───基准成本

basement complex───[岩]基底杂岩；基盘；杂岩

baseplates───n.基板；底板

box the compass───依次列举罗盘的三十二方位；兜了一个圈子

If you want to buy a compass, get one with a clear plastic baseplate meant for orienteering.───如果你想买，就要选购一个有透明塑胶底座的定向专用指北针。