Citizens of wealthy nations demand national parks, clean rivers, clean air and poison-free food.

富裕国家的公民要求有国家公园、干净的河流、干净的空气和无毒的食物。

youdao

A clean heart is a free heart.

一颗纯洁的心，是自由的心。

youdao

Wipe these surfaces with a damp cloth to ensure they are clean and free from any debris.

用湿布擦拭这些桌面，确保桌面干净没有任何碎屑。

youdao

On Tuesday,private water companies agreed to provide free clean drinking water to the relief effort.

VOA: standard.2010.01.26

"The elections will be fair and free and clean and exemplary, " Mr Bashir told a gathering in northern Sudan.

BBC: Sudan President Bashir insists elections will be fair

This free service will clean up your profile and pages for you.

FORBES: Scrub-Scrub-Scrub Those Facebook Pages From Graph Search

It is distributing free software to clean PCs.

BBC: South Korea hit by cyber attacks