1. The ucwords() function converts the first character of each word in a string to uppercase. 函数的作用是：将字符串中每个词的第一个字母大写。
2. You must name all uppercase letters, no matter how you spell the class name in the New Component dialog box. 无论你在新组件对话框中怎么拼写类名，都必须全部使用大写字母。
3. Variables representing constants a user might want to customize on the command line or in the environment are written in all uppercase, by convention. 当变量用来表示用户在命令行上或环境中所自定义的常数时，习惯上会全部以大写来编写其名称。
英英解释
n.
1. one of the large alphabetic characters used as the first letter in writing or printing proper names
2. relating to capital letters which were kept in the top half of a compositor's type case
