be found in several kinds of rocks

例句：

1. 1. The book is found in thelibrary.
   这本书在图书馆里。
2. 2. Thecity is found in thecenter of the country.
   这个城市位于国家的中心。
3. 3. The mineral is foundin the earth's crust.
   这种矿物存在于地球的地壳中。