airless 

68925
单词释义
adj.没有新鲜空气的,没有一丝风的,空气沉闷的
单词例句
Mobike, which emerged in 2016 and now operates in about 180 cities, mainly in China but also abroad, has introduced a spate of design innovations to make their bikes more user-friendly, including airless puncture-proof tires, shaft transmission system, solar-powered PV panel on some models to power the bike and a patented durable disc brake that can run for more than 10,000 km without failing.
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