The soft modulation of her voice soothed the infant.
她柔和

使婴儿安
。
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故事
9月合集 
四
阅读真题精听 She worked out that, if the left hemisphere was staying alert to keep guard in a strange environment, then it would react to the irregular beeps by stirring people from sleep and would ignore the regularly timed ones.
她发现,如果大脑左半球在一个陌生的环境中为了防卫而保持警觉,它就
对不规律的哔哔声做出反应,从而把人从睡梦中唤醒,而忽略定时响起且声调不变的哔哔声。
11月合集