在那么一刻，所有事使我有一个突然如此疼痛的感觉。

In one single moment, everything made such a painful sense.

youdao

这个时候，他会把自己的腿稍微挪一点点，缓解一下那疼痛的感觉。

Then he would wriggle his legs slightly, one at a time, trying toease the feeling back into them.

youdao

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.

youdao

If it's possible, use animals that don't feel pain, or use lower forms of life.

如果可以的话，请使用那些感觉不到疼痛的动物，或者用低级生物。

需要动物实验吗？ - SpeakingMax英语口语达人