| 例句 |
These sediments were deposited by floods thousands of years ago.这些沉积物是几千年前的洪水沉积下来的。In hard-water areas, a chalky deposit often forms in pipes and kettles.在水质较硬的地区，水管和水壶内常会形成白色沉积物。It is hoped that the oil slick will sink to the seabed where it would be covered within a few years by sediments and eventually decompose.人们希望浮油会沉到海底，并且在数年内被沉积物覆盖，最终分解。Petroleum occurs in natural deposits beneath the surface of the earth.石油出现在地表下面的天然沉积物中。 |