老鼠掉进书箱里 ——— 咬文嚼字
老鼠的牙齿总是不停地咬东西，老鼠掉进书箱里，咬的都是书本，所以说它“咬文嚼字”。“咬文嚼字”多用来讥笑死抠 (kōu) 字眼，而不领会精神实质的书呆子。有时也用来讥笑那些故意卖弄自己学问的人。（含贬义）
A mouse in a bookcase — chewing up the pages
If a mouse gets into a bookcase, what else can it do besides nibbling at the books? This phrase is mostly used sarcastically to ridicule a pedant who is over-fastidious about wording but fails to grasp the essence of a text. Sometimes it refers to someone who parades his vocabulary just to show off.