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n (pl C's, c's/ si:z; siz/) 1 the third letter of the English alphabet 英语字母表的第三个字母: `Cat' starts with (a) C/`C'. cat一字以c字母开始. 2 (music 音) the first note in the scale of C major C大调音阶中的第一音或音符. 3 academic mark indicating the third highest standard 学业成绩达第三等的评价符号: get (a) C/`C' in physics 物理（学科）得 C.



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