大黑熊刚坐下，就不小心摔倒了。
The big black bear just sat down and accidentally fell down.
黄昏的时候，他的脚不小心碰到了石头上，他摔倒了，再也站不起来了。
In the evening he hit his foot on a stone and fell down. He could not get up again.
黄昏的时候，他的脚不小心碰到了石头上，他摔倒了，再也站不起来了。
In the evening he hit his foot on a stone and fell down. He could not get up again.
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