锻炼后，他感到胸口有一种疼痛的感觉。

He felt an aching sensation in his chest after the workout.

到底是什么产生了疼痛的感觉呢？

What exactly creates these perceptions of pain?

这种物质增加对疼痛的耐受性，对抗紧张，并给人以健康的感觉。

This substance increases pain tolerance, counters stress and imparts a feeling of well-being.

那些把自己置身于疼痛中，在他们的内心深处，他们知道疼痛的感觉原来是那么的美妙。

Those who put themselves through pain, but know, deep down, how good it really feels.

一项发表在了“疼痛”杂志上的新的研究结果发现，当人们的手臂交叉，会减少他们对疼痛的感觉。

A new study published in the journal Pain found that when people crossed their arms, it reduced their perception of pain.

一项发表在了“疼痛”杂志上的新的研究结果发现，当人们的手臂交叉，会减少他们对疼痛的感觉。

A new study published in the journal Pain found that when people crossed their arms it reduced their perception of pain.

疼痛的感觉可能是剧烈而快速的，也可能是持续恶化的很久的钝痛。

The discomfort may be sharp or a dull ache that gets worse towards the end of the day.

冷冻破坏了癌细胞 、 炎症细胞以及引起疼痛的感觉神经细胞.

Freezing destroys the cancer cells, inflammatory cells, and small sensory nerve cells that cause pain.

这种装置产生的等离子体可以直接用裸手触摸，且能由使用者直接放入牙齿根管中来进行杀菌消毒，而不会导致过热，触电或者其它疼痛的感觉。

The plasma can be touched by bare hands and can be directed manually by a user to place it into root canal for disinfection without causing any heating, electrical shock, or other painful sensation.

其后的一个钟头，一层又一层的蛋白迭在患处，那个下午她不再觉得患处有疼痛的感觉，隔天患处只有不太明显的红色印记。

And during the next hour layer upon layer, she administered a white layer on her hand. That afternoon she didn't feel any more pain and the next day there hardly was a red mark to see.