If you've ever tried to change a personal habit (nail biting, for example) you know that it's virtually impossible unless you have something else to replace the old behavior.

如果你试着改变自己的某个个人习惯(比如咬指甲之类)，你会知道那基本上是不可能的，除非你能找到其他的事情来替换旧习惯。

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Much like nail biting, gum snapping can become an unconscious behavior used to relieve stress or boredom.

很像咬指甲，嚼口香糖可以成为缓解压力或摆脱无聊习惯使用的无意识行为。

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Like nail-biting and interrupting, this patterned, almost automatic behavior needs to be broken with a specific and proactive approach one that uses old-fashioned goals, motivating tactics, and rewards.

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