动词
中文翻译：保持
同义词：
['maintain', 'preserve', 'sustain']
例句：
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1. The team needs to keep their focus on the task at hand.
团队需要专注于手头的任务。
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2. She kept her promise and arrived early.
她遵守了承诺，提前到达。
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3. We need to keep an eye on the weather forecast for our trip.
我们需要关注我们的旅行的天气预报。