虽然人类的指甲没有动物的指甲强大、锋利，但是它们能帮助我们搔背，还有助于我们捡起硬币。
Our nails aren't as strong or sharp as the nails that animals have. But they are good for scratching backs and picking up COINS.
我用羽毛搔他的痒。
她刚走上百来步，又停下来，搔着自己的头。
Hardly had she gone a hundred paces when she paused and began to scratch her head again.
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