顺流而下

tā men chéng mù fá shùn liú ér xià lái dào xīn ào ěr liáng shì

他们乘木筏顺流而下来到新奥尔良市。

They rafted down the river to New Orleans.

chuán zài qīng chén yán hé shùn liú ér xià

船在清晨沿河顺流而下。

The ship dropped down the river early in the morning.