sea bottom deposit

• 海底沉积

sea bottom deposit的用法和样例：

例句

1. A very common sedimentary rock is called shale, which is a soft rock and was obviously formed by being deposited on the sea bed.
   一块极普通的沉积岩叫页岩，这种页岩质地松软，很明显是通过海底沉积作用形成的。