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 company is keeping a close watch on the market trends.
该公司正密切关注市场趋势。
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3. She kept silent throughout the meeting, not uttering a word.
会议期间她一言不发。