SS AS BS CS 就是红色字的
CS BS AS SS 结尾带S
同义词： rudiment first rudiment first principle alphabet ABC ABC's
以上来源于: WordNet
By 2005 Americawas a dropout, with no as or Bs, four Cs and ten Ds.
到了2005年，美国退学了—没有A和B，四个C和十个D。
youdao
My friend who works in a college admissions office offers this example: A high school kid submits a transcript pock-marked with As and Cs, while another posts solid Bs.
FORBES: The Truth About Productivity
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