鲱鱼在春天逆流而上产卵。

Shad migrate upstream to spawn in the spring.

鱼儿们在春天会逆流而上产卵。

Fish swim upstream in the spring to spawn.

鱼逆流而上，遇到了一个堰。

The fish swam upstream and encountered a weir.

鱼类会逆流而上迁徙到产卵地。

Fish migrate upstream to their spawning grounds.

他们的船在强劲的水流中逆流而上。

Their boat moved upstream against the strong current.

我们决定逆流而上，寻找河流的源头。

We decided to go upstream to find the source of the river.

我们必须逆流而上，才能到达那个偏远的村庄。

We have to travel upstream to reach that remote village.

这条小径沿着河流逆流而上，风景非常美丽。

This trail goes upstream along the river and the scenery is very beautiful.

现在，我们不再逆流而上，而是放松、睡觉、看电影或听音乐。

Now, instead of swimming upstream, we relax, sleep, watch movies, or listen to music.

转来转去不停止，于是石兽反而逆流而上了。

Don't stop, so the beast's upstream instead.