Imagine the ID card as the body of an animal, the pencil its long neck, and the eraser its head.

把身份证想象成一个动物的身体，铅笔是它的长脖子，橡皮擦是它的头。

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In Hayes' most recent study, he recruited 87 healthy volunteers and examined an area of their tongues about the size of the head of a pencil eraser.

在海斯的最新研究中，他招集了87个健康的志愿者，检查了这些人舌头的一块区域——大约铅笔上的橡皮擦头部大小。

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