fish shell 为重定向提供各种支持，比如把描述符组合成一个流和结束描述符。
The fish shell has rich support for redirection, such as combining descriptors into one stream and closing descriptors.
活动有一个摘要、描述、开始时间和结束时间。
Events have a summary, a description, a start time and an end time.
失业补助金已经结束的兰普蕾女士描述了艰难的就业市场。
Ms. Lampley, whose benefits have ended, described the tough job market.
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