问题描述：
We warned the children not to walk on the thin ice.
我们告诫孩子们不要在薄冰上行走.
把他改成
We warned the children to don't walk on the thin ice.
我们告诫孩子们不要在薄冰上行走.
把他改成
We warned the children to don't walk on the thin ice.
问题解答：
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