If the theory was correct, breathing air with extra carbon dioxide should have triggered yawning, while breathing pure oxygen should have suppressed yawning.
如果这个理论是正确的，那么吸入含有额外二氧化碳的空气应该会引起打哈欠，而吸入纯氧应该可以抑制打哈欠。
Volunteers were told to think about yawning, while they breathed either normal air, pure oxygen, or an air mixture with an above-normal level of carbon dioxide.
当志愿者在正常的空气中、纯氧的环境下，或者混有超过正常的二氧化碳含量的空气中呼吸时，他们被要求要想着打哈欠。
Volunteers were told to think about yawning while they breathed either normal air, pure oxygen, or an air mixture with an above-normal level of carbon dioxide.
当志愿者在正常的空气中、纯氧的环境下，或者混有超过正常的二氧化碳含量的空气中呼吸时，他们被要求要想着打哈欠。
You can knock out a few to-dos while others are still sitting in traffic or yawning through their first cups of coffee.
当别人还在乘车，或是拿着咖啡打着哈欠时，你已经完成了任务清单上的一些工作。
Yawning involves opening the mouth involuntarily while taking a long, deep breath of air.
打呵欠使人在不由自主张开嘴的同时，能长长的、深深的吸一口气。
Yawning involves opening the mouth involuntarily while taking a long, deep breath of air.
打呵欠使人在不由自主张开嘴的同时，能长长的、深深的吸一口气。
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