- the condition of having a low intelligence quotient (below 70)
| 单词 | mental retardation |
| 释义 | WordReference Random House Learner's Dictionary of American English © 2024 men•tal re•tar•da•tion /ˈmɛntəl ˌritɑrˈdeɪʃən/USA pronunciation n. [uncountable] WordReference Random House Unabridged Dictionary of American English © 2024
men′tal retarda′tion,
Collins Concise English Dictionary © HarperCollins Publishers:: mental retardation n
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