叹词。突然大喝一声，使人注意（多见于早期白话）。 《西游记》：“俺老孙来也，呔，哪里跑！”
研究表明定期锻炼的人产生大量乙种内啡呔以应付强烈的运动。
Studies have shown that persons who exercise regularly produce high level of Beta-endorphin in response to strenuous activity.
任何时候大笑，都会释放内啡呔这种物质。能有效地减少精神压力。
Whenever you laugh, you release endorphins, which are effective in bringing down stress levels.
凭借其提高“感觉良好”内啡呔浓度的能力，巧克力一直被用来提高情绪。
With its ability to boost "feel-good" endorphin levels, chocolate has long been used as a mood-lifter.
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