动词短语
中文翻译：功能减弱
同义词：
['functional decline', 'performance decline']
例句：
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1. As the patient's condition worsened, his ability to perform daily tasks declined.
随着病人病情恶化，他执行日常任务的能力下降了。
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2. The aging process gradually leads to a decline in cognitive function.
随着年龄的增长，认知功能逐渐下降。
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3. The team's performance has been declining in recent matches.
该队最近几场比赛的表现一直在下滑。