因此，科学家最近做了这样一个实验：给被实验者看一些发怒的人和看起来让人害怕的人的照片，测量当时他们的大脑活动。
So scientists recently tested this by measuring people's brain activity as they responded to pictures of angry people and pictures of people who look afraid.
他害怕从一个高建筑物的顶部往下看。
He was frightened to look down from the top of the tall building.
五个人中有一个人害怕看牙医。
五个人中有一个人害怕看牙医。
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