e-folding time 指数递减时间 ; e折减时间
Since then, he has read many books about paper folding and practised folding paper in his spare time.
从那时起，他阅读了很多关于折纸的书籍，并在业余时间练习折纸。
During this time I started to take a full-size folding bike with me when I traveled so I got to experience other cities as a cyclist as well.
这些年来，我出行的时候总是带着一辆全尺寸的折叠单车，所以我也能像一名骑行者那样去领略其他城市的各种风情。
Email saved the time and trouble of printing letters, folding them up and putting them in envelopes.
电子邮件帮人们省去了打印、折叠信件并放进信封的时间和麻烦。
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