1. 坎儿井、(巴基斯坦的)灌溉暗渠：购买选择权、看涨期权 call option | 坎儿井、(巴基斯坦的)灌溉暗渠 karez | 侃价 bargain
2. 灌溉暗渠 坎儿井：karema /卡雷马风/ | karez /灌溉暗渠/坎儿井/ | karidium /氟化钠/
3. 坎儿井 (串井,水巷)：开挖强度 excavation intensity | 坎儿井 (串井,水巷) karez | 抗冻标号 frost resistance index
1. karez
1. The karez wells are vertical shafts and subterranean canals that surface in the form of ditches and small ponds.