old-fashionedused for describing a child or student who is unable to make normal progress in learning. It is now more acceptable to say that someone has learning difficulties. (儿童或学生)智力发育迟缓的,迟钝的
VERBS | ADVERBVERBS➤be, seem落後;遲鈍;好像落後ADVERB➤extremely, fairly, very, etc.極其/相當/非常落後◇a rather backward part of the country該國相當落後的一個地區➤economically, educationally, technologically在經濟/教育/技術方面落後