形容词
中文翻译：Unknown
同义词：
['slow', 'lagging', 'behind']
例句：
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1. The child is retarded in language development.
这个孩子在语言发展上迟缓。
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2. The team's performance was slow to improve after the game.
比赛后，球队的表现迟迟没有提升。
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3. The old man is lagging behind his younger colleagues in terms of experience.
这位老人在经验方面落后于他的年轻同事。