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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？
Yes, of course.So which type of joint can you crack?Is it … a) fibrous? b) cartilaginous? Or c) synovial?
当然。哪种类型的关节可以掰得咔咔作响？a) 纤维状的?b) 软骨的?还是 c) 分泌滑液的?
And I said: c) synovial.
我选的是c) 分泌滑液的。
You are quite clever actually because you are right, or was it a good guess?
你确实很聪明，你回答对了。或者说猜的好？
It was a good guess.
确实是猜的好。
Well done! And synovial is the name for the fluid that surrounds this type of joint.
做的不错。滑液是关节周围的液体。
OK. So can we hear the words we learned today again?
好了，我们再来听听今天学到的单词吧？
Of course. We heard:
今天听到的单词有：
make your flesh creep
毛骨悚然
arthritis
关节炎
an old wives’ tale
无稽之谈
rehabilitation
复原
MRI (Magnetic Resonance Imaging)
核磁共振成像
insight

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