动词
中文翻译：保持
同义词：
['maintain', 'preserve', 'sustain']
例句：
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1. We need to keep the lights on until we leave.
我们需要保持灯开着直到我们离开。
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2. The company keeps a close eye on its competitors.
这家公司密切关注其竞争对手。
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3. She kept her promise and came back after the rain.
她信守承诺，雨停后回来了。