Generally, milk bottles at the front of the shelf in the supermarket have an expiry date of only a few days.

通常，超市中架子前的瓶装奶仅有几天的有效限期。

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The truth is, tires do not have an expiration date but they do have a limited shelf life2.

事实上，轮胎没有某个使用截止日期，但是它们确实有一个有限的货架寿命。

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You can really decide if you want to commit to it and work on it more or put it on a shelf for a later date.

你就可以决定,你是否想落实它,更多地为它努力或是暂时搁置它，以后再落实。

斯坦福公开课 - Twitter之父Jack.Dorsey演讲：好奇和灵感的力量课程节选