I need to do away with my knuckle cracking.

我要戒掉掰手指节的习惯。

His left hand was perfectly fine, and had no noticeable effects from a lifetime of daily knuckle cracking.

他的左手完全没有问题，没有因每天掰指关节而产生明显的影响。

Any time! Any time, Rob! Now let's hear from the professor again about the medical value of research into knuckle cracking.

不用客气！罗伯，不用客气！现在让我们再来听一听教授对医学上对掰指关节研究的介绍。

When you crack your knuckles, it squeezes those microscopic bubbles that build up in your fluid and they all pop making that distinct, oddly satisfying knuckle cracking noise.

当你掰指关节时，它会挤压你的滑液中积聚的那些微小气泡，它们就会爆裂，发出独特的、奇怪的令人满意的指关节咔嚓声。