Another experiment demonstrated that physical exercise, which was sufficiently vigorous to double the rate of breathing, had no effect on the frequency of yawning.
另一项实验表明，体育运动——尤其是剧烈的运动——可以使呼吸频率增加一倍，但这对打哈欠的频率没有影响。
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.
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 gas would have the dual effect of choking air-breathing animals and preventing sunlight from reaching Earth's surface.
这些有毒气体不仅会使动物造成了窒息，而且对照射到地球表面的阳光产生了严重阻挡。
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