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。
But people who can crack their knuckles may actually have healthier joints than others.
先前的研究显示，25%到54%的人掰指关节，掰指关节的男性比女性多。
Previous studies have shown that between 25 and 54 per cent of us crack our knuckles - with men doing it more than women.
为什么会出现这道白光，以及为什么掰指关节会发出这么大的声音，还有待进一步研究。
Further research is needed into this streak of light - and why the cracking sound is so loud.
对洛杉矶私人疗养院居民的比较研究发现，那些经常掰指关节的人关节比较不容易受到损伤。
One comparison of Los Angeles nursing home residents found those who had regularly cracked their knuckles were actually less likely to have damaged joints.
这项研究的美国研究员总结道：“掰指关节的主要不良后果在于，关节的响声会让周围的人感到不舒服。”
The US researchers behind that study concluded: 'The chief morbid consequence of knuckle cracking would appear to be its annoying effect on the observer. '
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。
So scientists have performed experiments to imitate what happens in a human joint when you crack your knuckles.
不仅是指关节可以掰响，脖子，后背，膝关节，脚踝，脚趾都可以。
But it isn't just finger knuckles that crack - you can do it with your neck, back, knees, ankles and toes.
不仅是指关节可以掰响，脖子，后背，膝关节，脚踝，脚趾都可以。
But it isn't just finger knuckles that crack - you can do it with your neck, back, knees, ankles and toes.
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