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Well, when you stretch or bend your finger to pop the knuckle, you’re making the bones of the joint pull apart… like this…(cracking knuckles)
当你伸展或弯曲手指，掰响指关节，就使得关节处的骨头撕裂开，就像这样（掰响指关节的声音）。
Please don’t do it again!
拜托别这样了。
Well, it stretches the space around the joint and surrounding fluid and causes a decrease in pressure.As a result, gas dissolved in the fluid becomes less soluble – or less able to be dissolved – leading to the formation of bubbles.Now when you stretch the joint far enough, these bubbles burst, producing the ‘pop’ sound.
掰响指关节时，关节和周围滑液的空间拉大，压力减小。最终溶解在滑液中的气体愈发不溶于液体，产生微小的气泡。当你尽可能的伸展关节时，这些气泡破裂，发出“砰”的响声。
Ouch! Excellent – well, thanks for the biology demonstration there, Neil …
太奇妙了，多谢你这专业的生物学解释。
Any time! Any time, Rob!Now let’s hear from the professor again about the medical value of research into knuckle cracking.
不用谢，不用谢。我们再来听听教授对掰响指关节研究的医学价值的看法。
When our engineering colleagues do this between two flat surfaces say of ceramic or porcelain… When they do this and they pull them apart quickly and there’s a little bit of fluid in betweenthey can use electron microscopy to see there’s been tremendous damage to the surfaces of the joints.But for some reason we don’t see that in the human joint.There’s something that makes it very resilient.
我的同事用两个陶瓷平面来模拟这一现象，平面中间还有一些液体，他们快速的将两个平面分开，然后使用电子显微镜来观察这对关节平面造成的巨大损害。但是不知道基于什么原因我们未能在人类关节上看到这一点。有什么东西让关节变得很有弹性。
Interesting stuff!So scientists have performed experiments to imitate what happens in a human joint when you crack your knuckles.And when you quickly pull apart a pair of ceramic – or clay – tiles with fluid between them, it causes a lot of damage to the surface of the tiles.
很有意思。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。当人们迅速地将中间含有液体的两块陶瓷片分开时，陶瓷片表面受到了巨大损害。
So why don’t human joints get damaged as well?
为什么人类关节并未同样受到损害呢？
Well, the scientists don’t actually know.They can see the damage to the tiles using electron microscopy – that’s a very powerful microscope.But it’s not clear what makes the human joint so resilient to damage – and resilient in this context means returning to its original shape after being stretched or bent.
科学家们也不知道具体原因。他们用高倍数的电子显微镜观察到瓷片的损伤。但是仍不清楚是什么使得关节弹性加大免于损伤。这里的弹性是指在拉伸弯曲过后恢复到以前的形状。
Right. But with further research scientists may be able to find out – and then use this information to help people with joint problems.
没错，但是经过进一步的调查，科学家们也许会有所发现，利用这些信息帮助人们处理关节问题。
Or they could create synthetic – or man-made – materials which can withstand wear and tear better than current ones.Withstand means not be damaged by somethingand wear and tear means damage as a result of ordinary use.
或者他们能发明人造材料，比现在的关节更加经得住磨损。经得住是指不会因某物而损害，磨损是指在平常使用中收到损伤。
Can we have the answer to today’s quiz question now, Rob?
现在该公布之前问题的答案了吧？

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