The steam heating and the electric heating may select, under draining water USES drains water, the available hose directs to the trench, maintains indoor clean.

蒸汽加热及电加热可选用，排水采用下排水，可用软管引至地沟，保持室内清洁。

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Moreover, families can make use of air purifiers to clean the indoor air.

此外，也可以利用空气净化器来清洁室内空气。

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We believe that everyone is entitled to clean indoor air and we can achieve this by taking positive steps towards managing air quality in the workplace.

我们相信每个人都有权生活在清洁的室内空气中，通过积极地采取措施控制工作环境空气质量，我们就能达到这一目标。

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BAC and 10 other organizations offer services and classes there, in everything from how to clean a home, to proper indoor plumbing etiquette, to employable skills.

VOA: standard.2010.07.22

For years, public health researchers have been running projects that demonstrate that asthma symptoms can be substantially reduced by working in homes to remove or clean moldy carpets, provide indoor air filters and reduce infestations of dust mites and cockroaches.

FORBES: Obamacare Spurs New Thinking On Using the Market to Pay for Prevention

Yet, despite all the evidence implicating both indoor and outdoor air pollution's harmful impact on public health, we still have so much to do to clean up our act.

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