Although you might begin training to read more with excitement or enthusiasm, these can quickly disappear if you don't devise a method of rewarding or motivating yourself.

尽管你可能开始训练自己靠着兴奋和热情多读书，但是如果你不想出奖励或激励自己的方法，这些情感很快就会消失。

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The progress you've made on developing new habits, and improving your fitness, will quickly disappear.

你建立新习惯的过程，比如塑造好的体型，会很快消失。

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Before, emails would appear and quickly disappear in my inbox, only to be re-downloaded, or sometimes not.

以前，我的收件箱里的电子邮件有时会突然消失，只能重新下载。

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Farmers generally earn money at markets, and the ones where they don't quickly disappear.

WSJ: Copycat Farmers' Markets Reap a Crop of Complaints

Now, however, the future really does look bleak: even this business may quickly disappear.

ECONOMIST: Futures markets

From an evolutionary standpoint, the trouble with altruism is that if an altruistic behaviour is costly for example, dying for someone else then the genes that promote it should quickly disappear from the population.

ECONOMIST: Bill Hamilton