Dtd
abbr. 文件类型定义（document type definition）
🗣️ 情景例句
I'll call you again later, OK?
我以后再打给你，好吗？
One should travel out of his own country at least once.
我们至少应该离开自己的国度去旅行一次。
Jim ran very fast, but Yu Yan from Class 1 ran faster. He began to catch up with Jim.
吉姆跑得非常快，但是1班的余延跑得更快。他开始赶上吉姆。