B4的完整形式是什么？-CSDN博客
文章浏览阅读599次。B4：之前 (B4: Before)B4 is an abbreviation of "Before". B4是“ Before”的缩写 。 It is an expression, which is commonly used in messaging or chatting on social media networking sites like Facebook, Yahoo Me..._b4完整形式...
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