We sailed slowly down/up the river.

我们慢慢地顺流而下/顺流而下。

Cover it up for a little bit longer. I can hear the tractors in the rice field. It goes up and down up and up down.

盖上盖再炖一会。我能听到稻田里拖拉机的声音，时高时低。

She turned around and started running back up the hill she'd just stumbled down.Up one hill, down the next.

她转过身，开始向刚才好不容易爬下来的山丘又爬上去，爬上一座山丘然后又爬下另一座。