爷爷把孙子放在膝盖上轻轻颠着逗他笑。

Grandpa dandled his grandson on his knees to make him laugh.

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Grandpa dandled his grandson on his knees to make him laugh.

dandled 是动词 dandle 的过去式。dandle 指"轻轻颠动(小孩)",通常是把小孩放在膝盖上上下颠动来逗乐。这个词专门用来描述这种逗小孩的动作。

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