三到四个字母的常见短单词，注意空格用拇指击打。
cat dog run sit top hat pen cup map bus red sun sky one two six ten big hot cold fast slow up down in on at by me we he she it is as if or
点击页面任意位置后直接开始输入,退格键可修正;最后一个字符输入正确后自动结算。