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 performance high throughout the season.
球队在整个赛季中需要保持高水平的表现。
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2. The company keeps its headquarters in New York City.
该公司将其总部设在纽约市。
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3. She kept her promise and visited him on his birthday.
她履行了承诺，在他生日那天去看望他。