1. Peridotite is a dense, coarse-grained rock that is found deep in the Earth's mantle.
橄榄岩是一种在地球深处地幔中发现的密集、粗粒的岩石。
2. The presence of peridotite in certain regions suggests the possibility of diamond deposits.
某些地区存在橄榄岩，暗示了钻石矿床的可能性。