firston Basic wordsalso onCEFR Beginners (A1)? CEFR Elementary (A2)? CEFR Intermediate (B1)? CEFR Upper intermediate (B2)? CEFR Mastery level (C2)? Academic Vocabulary List (AVL)? Academic Chunk List (ACL)? Contributions (SIG)? Band 1 (BND1)? Band 2 (BND2)? 第一的, 优先,第一,首先, 开始,第一 firsts firsts(noun) 一等品,一级品(first的复数形式) first first(adjective) 第一的 first first(adverb) 优先,第一,首先 first first(noun) 开始,第一 firstly firstly(adverb) 第一,首先(主要用于列举条目、论点时) Forms nounadjectiveadverb firsts first first first firstly