1. The geologists costeaned the area to determine the extent of the mineral deposit.
地质学家们进行了沿着矿脉地下钻探的工作，以确定矿床的规模。

2. The mining company costeaned several potential sites before deciding on the best location for the new mine.
该矿业公司在选择新矿场的最佳位置之前进行了多次地下钻探。