动词
中文翻译：保持
同义词：
['maintain', 'preserve', 'sustain']
例句：
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1. She kept her promise to help me with the project.
她承诺帮助我完成这个项目。
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2. The team kept working hard despite the challenges.
尽管面临挑战，团队还是努力工作。
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3. We need to keep our eyes open for any potential problems.
我们需要警惕任何潜在的问题。