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 windows closed to prevent the cold air from entering.
我们需要关紧窗户，以防冷空气进入。
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2. The team needs to keep practicing to improve their skills.
这个团队需要不断练习以提高他们的技能。
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3. She kept her promise and arrived on time.
她遵守了承诺，准时到达。