问题描述：
this bag of rice is much ( heavy ) than that one.( heavy )怎么变啊?
this bag of rice is much ( heavy ) than that one.( heavy )怎么变啊?给我讲下为什么这么做?
this bag of rice is much ( heavy ) than that one.( heavy )怎么变啊?给我讲下为什么这么做?
问题解答：
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