当人们参与有助于他人的活动时，他们的大脑会释放出内啡肽，这是一种大脑中天然的麻醉剂，能让人产生幸福感。
When people engage in activities that help others, their brain releases endorphins, the brain's natural opiates, which induce in people a feeling of well-being.
据说，无拘束的欢笑和瑜伽呼吸(方式）相结合能够舒缓肌肉，刺激一种脑内化学物质——内啡肽的产生，而这种物质能带产生使人感觉良好的效果。
The combination of unconditional laughter and yogic breathing is said to stretch muscles and trigger endorphins –the chemical in the brain known for its feel-good effect.
笑能让人感觉更高兴，因为有内啡肽的释放，还会更健康，因为压力得到了排解。
Smiling makes a human feel happier because of the release of endorphins andhealthier because of stress relief.
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