河流的上游水质通常比较好。
héliú de shàngyóu shuǐzhì tōngcháng bǐjiào hǎo 。
The water quality in the upper reaches of the river is usually better.
我们去上游探险，看到了美丽的自然风光。
wǒmen qù shàngyóu tànxiǎn ， kàndào le měilì de zìrán fēngguāng 。
We went to the upper reaches for an adventure and saw beautiful natural scenery.
上游的环境保护对下游非常重要。
shàngyóu de huánjìng bǎohù duì xiàyóu fēicháng zhòngyào 。
Environmental protection in the upper reaches is very important for the lower reaches.