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.

This custom has been carried down from the 18 th century.

这一习俗从18世纪一直传到现在。 。

They took root in the slimy sediments which had been carried down from the tops of the hills and they became plants.

于是它们在从山顶冲刷到水底的淤泥间扎下根来，变成了植物。

He had evidently been carried down by two persons, one of whom had remarkably small feet and the other unusually large ones.

显而易见他是被两个人抬过去的。一个人的脚异常小，另一个人的脚却大得出奇。