a. 大写字母的vt. 用大写字母写, 以大写字母印刷
a. relating to capital letters which were kept in the top half of a compositor's type case; X and Y and Z etc"
1.The uppercase contains the capitals, which is why we call them uppercase.
上面的盒子里装的是大写字母 大写字母这个词也由此而来