A. There are many table manners. B. People need to pay attention to table manners.
A. Scientists are studying how to reduce environmental damage. B. Scientists are studying new methods of power generation.
A. Mo Yan won the first Nobel Prize in literature. B. Moyan is the first Chinese writer.
A. There are two legends. B. The custom has two legends.
After paper was invented. B. The ink stone was developed.
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