However, many people pollute lakes and rivers with waste water, so we must stop some people or some factories from wasting water or polluting water and help keep the water clean.

然而，许多人的排泄物污染的湖泊和河流的水，所以我们必须阻止某些人或某些工厂浪费水或污染水，同时，有助于保持水的清洁。同时，我们应该节约大量水的情况。

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However, many people pollute lakes and rivers with waste water, so we must stop some people or some factories from wasting water or polluting water and help keep the water clean.

然而，许多人的排泄物污染的湖泊和河流的水，所以我们必须阻止某些人或某些工厂浪费水或污染水，同时，有助于保持水的清洁。同时，我们应该节约大量水的情况。

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