我们正溯溪而上寻找源头。
We are following the creek to its source .
对喜欢从事水上活动的人来说，如游泳、冲浪、溯溪、浮潜、潜水、滑水、划船等，微生物污染也带来了严重的威胁。
Microbial pollution also poses a serious danger to people involved in common recreational activities such as swimming , surfing , wading , diving , snorkeling , waterskiing and boating .
溯溪