这句话我觉得有点别扭：It is expected to increase China’s production capacity of 1-butene from 1 Mtpa to more than 2 Mtpa within the next 3-5 years.
我给改成了：It is expected that China’s production capacity of 1-butene will increase from 1 Mtpa to more than 2 Mtpa within the next 3-5 years.
第一句话是哪里有问题吗？还是语法没问题，就是别扭？
第二句话应该比较好吧？
China’s production capacity of 1-butene is expected to increase from 1 Mtpa to more than 2 Mtpa within the next 3-5 years.
在未来3-5年内,中国的1-丁烯产能预计将从每年100万吨增加到每年200万吨以上。
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