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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A doctor with ideas as to psychiatric treatments asked him "if they were biting," to which he received the harsh reply: "Of course not, you fool, since this is a bathtub."

一个精通心理治疗的医生曾问他，“是否鱼儿在咬钩”，结果却得到了一句刺耳的回答：“当然不会了，你这个笨蛋，这是浴桶！”

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While nail biting is not generally harmful, if you attack the cuticles you can risk bleeding and bacterial infection.

虽然啃咬指甲通常不会使人受伤，但如果你咬伤了指甲周围的皮肤，仍然会导致出血并可能造成细菌感染。

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Occasionally he grimaces, as if he were biting down on the golden flames in his mouth.

NEWYORKER: Baptizing the Gun

That way, if the fish aren't biting, you can check fantasy baseball.

FORBES: Off the Grid But in the Game

Wales face Italy in the Millennium Stadium next and there will be some nail-biting as the players wait to see if they have done enough to keep the red shirt on their back.

BBC: Fear drives Wales team forward