These additional resources lead to a massive increase in algae growth known as eutrophication.

这些额外的资源会让水的生长大大增加，就是所谓的「优养化」。

Eutrophication is one reason why we need to be careful with fertilizers when we are growing crops.

富营养化是我们在种植作物时需要小心使用肥料的因之一。

So, eutrophication happens when nutrients are added to water which causes an algal bloom, cutting off sunlight and feeding bacteria.

因此，当向水中添加营养物质导大量繁殖、隔绝阳光并滋生细菌时，就会发生富营养化。

Eutrophication starts with fertilizers, which are rich in nutrients like nitrate and phosphate, are washed into the river or lake system.

富营养化始于肥料，这些肥料富含硝酸盐和磷酸盐等营养物质，被冲河流或湖泊系统。

But human activity has made eutrophication a regular and widespread occurrence.

但人活动让优养化。

But at night, when the sun goes down, and the plants and algae stop releasing oxygen into the water, a phenomenon called eutrophication occurs.

但到了晚上，太阳下山，植物和停止向水中释放氧气时，就会发生一种名为“富营养化”的现象。