一开始我爸爸给我解释怎么样牙齿才算真正刷干净了：当我用手指划过牙齿表面的时候，能听到犹如鸟叫一般的吱吱声。

In the first my dad explains how I can tell if my teeth are clean: I'll hear squeaking, like birds chirping, when I run my finger across the tops of them.

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另一个值得提及的特殊技能是不是刷的手指画，它创建了一个非常不同的作用。

Another special skill worthy of mention is painting with fingers instead of a brush, which creates a very different effect.

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