动词短语
中文翻译：加倍努力
同义词：
['double down', "double one's efforts"]
例句：
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1. She decided to double up on her studies after the exams.
考试后，她决定加倍努力学习。
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2. The company doubled up on its marketing efforts to attract more customers.
该公司加大了市场营销力度，以吸引更多客户。
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3. He doubled up his efforts to finish the project ahead of schedule.
他加倍努力，提前完成了项目。