I tried to force them back by grinding my teeth together.

我咬紧牙关竭力忍住了。

OK, let's recap the rest of the vocabulary, starting with mortar and pestle a bowl and a heavy stone which is used to grind ingredients together.

好的，让我们回顾一下剩下的词汇，从研钵及研杵开始 ——用来将食材碾磨在一起的碗和重石。

OK, let's recap the rest of the vocabulary, starting with mortar and pestle – a bowl and a heavy stone which is used to grind ingredients together.

好了，我们来回顾一下其它词汇，从“mortar and pestle”开始，指一个碗和一个沉重的石头，用来研磨食材。

If those bones were always rubbing, scraping, and spinning against each other, they would wear out pretty quickly as we age, so our bodies naturally cover our joints in fluids that keep the bones connected without grinding together.

如果这些骨头总是相互摩擦、刮擦和旋转的话，随着我们年龄的增长，它们很快就会磨损，所以我们的身体关节处就充满了液体，以保持骨头互相连接，但是却不会磨损。