名词
中文翻译：双倍
同义词：
['twinning', 'doubling']
例句：
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1.The cost of the new product is double that of the old one.
新产品的成本是旧产品的两倍。
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2.He doubled his efforts to finish the project on time.
他加倍努力，按时完成了项目。
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3. The teacher doubled the homework for the next day's test.
老师为了第二天的考试，将作业量加倍。