laid down

• 沉积

laid down的用法和样例：

例句

1. Most of the sand and silt was carried down from the river.
   大部分泥沙都是由河流沉积下来的。
2. They say that certain chemicals are made and laid down in the living cells.
   他们说已在活细胞内培养出某些化学成分，并已沉积下来。