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。
We will be improving the quality and frequency of daily exercise, and of our Physical Education program.
我们将会提高每日锻炼的频次和质量，也会进一步完善我们的体育教学。
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