试着在睡前阅读或听安静的音乐，而不是使用电子产品。
Try reading or listening to quiet music instead of using electronics before bed.
我们有信心制造出使用更少燃料、排放更少气体、运行更为安静的航天飞机，而我们也正致力于实现这个伟大的目标。
We believe it is possible to build an aircraft that uses less fuel, gives off fewer emissions, and is quieter, and we are working on the technologies to create that aircraft.
自此自后，使用氢氧或其他像甲醇等燃料的燃料电池就被冠以清洁，安静绿色能源的名号而被大力追捧。
Ever since, fuel cells burning hydrogen or other fuels such as methanol have been touted as clean, quiet and green power sources.
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