动词短语
中文翻译：重复做某事
同义词：
['repeat', 'double effort']
例句：
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1. She decided to double her efforts in order to improve her grades.
她决定加倍努力以提高成绩。
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2. The company doubled its investment in the new project.
该公司在新的项目中加倍投资。
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3. He doubled his efforts and finally succeeded in completing the task.
他加倍努力，最终完成了任务。