Fans of electric cars say they are clean, quiet, and economical.

电动车爱好者说电动车无污染，无噪音，而且经济。

《柯林斯英汉双解大词典》

Snakes are also very clean and quiet and they seldom trouble humans.

蛇也非常干净、安静，很少打扰人类。

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They don't have the exercise requirements like dogs. Besides, they are quiet and clean.

它们不像狗那样有运动的需求。此外，它们安静又干净。

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It's clean, quiet and a rarity among drip machines for maintaining the optimal 200-degree brewing temperature.

FORBES: Magazine Article

Opponents reckon they have colluded in making up optimistic projections about the speed with which airlines will change to yet-to-be-built clean, quiet aircraft.

ECONOMIST: Business travel

In the video, the developer discusses the elements of stealth you can use in order to better sneak about and make clean, quiet assassinations.

FORBES: Watch The New 'Dishonored' Study Of Stealth Gameplay Video