If we had to listen to that signal every time we felt an ache or pain, we wouldn't be able to do anything.

如果我们每次感到疼痛时都要听那个信号，我们就什么都做不了了。

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If a man speaks or ACTS with an evil thought, pain follows him. If a man speaks or ACTS with a pure thought, happiness follows him, like a shadow that never leaves him.

如果一个人讲话或做事邪恶，痛苦将紧紧跟随他的脚步如果一个人讲话或做事纯粹，快乐就会降临，如影随形。

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Please note that if your eyes are in pain or you suddenly experience flashes of light, you must contact a doctor immediately.

切记如果你的眼睛有疼痛感或者经历闪光你需要立即联系医生。

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We live in a gravitational field and that it affects our day to day life, and if you have hip pain or a hip that's diseased in some way, and you can't stand up against that gravitational field in the same way, that severely limits what you can do in the world.

我们生活在一个重力场中,这个场影响着我们的日常生活,如果你的髋关节疼痛,或者有其他髋关节疾病的话,就不能像平常一样,站在这个重力场中了,这严重限制了人的活动能力

耶鲁公开课 - 生物医学工程探索课程节选

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

That might include if he or she is ever in pain or has a terminal illness.

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Remember that the symptoms of teething may mimic that of mouth sores or other infections so check with your pediatrician if your baby's pain lasts longer than a few days or if he has other symptoms such as fever, extreme fussiness or poor eating.

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