The town uses the money to repair roads and the local waste water treatment system.

该镇用这笔钱来修路和当地的废水处理系统。

By the time the expansion is finished, Singapore will have spent about $7.4 billion on its water treatment systems.

到扩建完成时，新加坡将在其水处理系统上花费约74亿美元。

A water treatment system removes radionuclides and reduces radioactivity.

水处理系统去除放射性核素并降低放射性。

Scientists say if used oil is poured down drains or released into nature, it can pollute water treatment systems and the environment.

科学家称，如果将使用过的油倒入下水道或排入大自然，它会污染水处理系统和环境。

Now, this usually involves combining what's known as grey and green infrastructure – so things like advanced drainage and water treatment systems alongside natural and semi-natural areas.

现在，这通常涉及结合所谓的灰色和绿色基础设施——比如先进的排水和水处理系统以及自然和半自然区域。