动词
中文翻译：双重
同义词：
['double up', 'double down', 'double back例句：1. The book has two volumes.（这本书有两卷。）']
例句：
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1. The book has two volumes.
这本书有两卷。
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2.She doubled her efforts to finish the project on time.
她加倍努力以按时完成这个项目。
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3.He double-checked his calculations before presenting his report.
在提交报告之前，他再次核对了他的计算。