[气球r]分为5级, 五个等级:pre-primer,primer,1st grade,,2nd grade
webster's new world thesaurus(《韦氏新世界英语同义词词典》)是一
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primer,1stgrade, 2ndgrade,3
5个级别,分别是 preprimer,primer,1st grade,2nd grade,3rd grade.
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