是发生于舌两侧边缘的白色或灰色的病变，病变也可延伸到舌腹部及舌背部，不能擦除。

Both sides of the edge of the tongue is white or gray lesions, lesions can also be extended to the tongue, belly and tongue back, can not be erased.

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毛状白斑是发生于舌两侧边缘的白色或灰色的病变，病变也可延伸到舌腹部及舌背部，不能擦除。

Hairy leukoplakia are on both sides of the edge of the tongue occurred in the white or gray lesions, lesions can also be extended to the tongue and the tongue back, abdomen, should not erase.

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擦除意味着一个类不能同时实现 Comparable和 Comparable，因为事实上两者都在同一个接口中，指定同一个 compareTo()方法。

One of the implications of erasure is that a class cannot implement both Comparable and Comparable, because both of these are in fact the same interface, specifying the same compareTo() method.

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