So scientists have performed experiments to imitate what happens in a human joint when you crack your knuckles.
科学家们进行模拟实验，查看人类掰响指关节会发生什么事。
They crack loud jokes, they crack their knuckles, they crackle their chewing gum, they clank spoons in coffee cups like they're calling the cows to come in from the fields.
他们大声地说笑话、大声地弄得关节吱吱作响、大声地嚼口香糖、大声地搅拌杯子里的咖啡，就好像他们想把田野里的牛叫进来一样。
But people who can crack their knuckles may actually have healthier joints than others.
但实际上，那些“咔咔”地掰指关节的人比其他人拥有更健康的关节。
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