打哈欠

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　　According to conventional theory, yawning takes place when people are bored or sleepy and serves the function of increasing alertness by reversing, through deeper breathing, the drop in blood oxygen levels that are caused by the shallow breathing that accompanies lack of sleep or boredom.(TPO18, 45)

　　conventional /kən'vɛnʃənl/ adj. 传统的;老套的，千篇一律的;约定的

　　alertness /ə'lə:tnis/ n. 警戒，机敏

　　reverse /rɪ'vɜːs/ v. 使(某物)反转; 将(某物)翻转;转变

　　我是分界线，大家先一遍速读看是否理解

　　(According to conventional theory), yawning takes place (when people are bored or sleepy)and serves the function (of increasing alertness) (by reversing, through deeper breathing, the drop in blood oxygen levels) (that are caused by the shallow breathing) (that accompanies lack of sleep or boredom).(TPO18, 45)

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本作文是关于初中初一700字的作文，题目为：《蚂蚁打哈欠》，欢迎大家踊跃投稿。