binary digit character

• 二进制数字符,二进制数字字符

binary digit character的用法和样例：

例句

1. A word is defined as a sequence of alphanumeric characters, so the end of a word is indicated by whitespace or a non-alphanumeric character.
   单词被定义为一个字母数字序列，因此词尾就是用空白符或非字母数字符来标示的。