今年我在家用电器展上所见的所有产品中，Powermat公司或许是技术上最整洁的了。

Out of all of the products that I've seen from the Consumer Electronics Show this year, the Powermat may be the most technologically uncluttered.

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她说着，如果可能的话，带着柔和的语气，她的穿着提醒着我，这儿只有最轻松和最整洁的家务活需要做。

She speaks, if possible, in a softer voice; she wears a garment which reminds me that there is only the lightest and cleanest housework to be done.

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总的来说，法国游客位居全世界21国游客的19位，与排在第一位的被视为最有礼貌、最安静、最整洁的日本游客相去甚远。

Overall, French travelers landed 19th out of 21 nations worldwide, far behind the first-place Japanese, considered the most polite, quiet and tidy.

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What was neat about it is before that time, the predominant species to use for air conditioning or refrigeration was ammonia.

在这之前是很整洁的，之前最主要的用于空调或者冰箱的,物质是氨。

麻省理工公开课 - 固态化学导论课程节选