Sometimes, we think they are dirty and we don't want to close to them. It's not right. They clean our environment by their hard work.

有的时候，我们会觉得他们很脏，甚至不想靠近他们，这是不对的，他们通过自己的辛勤工作使环境清洁了。

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Pollution—in general, recycling materials can produce less pollution, helping to keep our environment clean.

污染——一般来说，回收材料可以产生较少的污染，有助于保持我们的环境清洁。

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The acceptance tests took place in our development environment, starting with clean builds according to the build documentation and leading into execution of the test procedures.

验收测试发生在我们的开发环境中，开始于根据构建文档进行清洁的构建，并引发测试过程的执行。

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Together, setting a market for and incentivizing clean energy, we have the ability to take the steps we need to lessen our dependence on foreign oil and to help clean up our environment.

WHITEHOUSE: Press Briefing

For 15 years, our country has celebrated America Recycles Day as a time to focus on conserving valuable materials, keeping our communities clean, and protecting our environment.

WHITEHOUSE: Presidential Proclamation -- America Recycles Day, 2012

There are thousands of Floridians right now who are making a great living promoting solar energy and wind energy and clean energy, all across this state. (Applause.) We doubled our investment in clean energy, which is creating jobs and is good for our environment.

WHITEHOUSE: Remarks by the President at a Campaign Event in Miami, FL