that is a pen

那是一支钢笔

that is to say───就是；即；换言之

that is it───就是这样

that is that───就是这样

what is more───而且

that's an idea───这是个主意

that's as may be───那是可能的

data pen───数据笔

that is───即；就是说；换言之

that's all───就这样；说完了

This is a book. That is a pen.───这是一本书，那是一枝钢笔。

That is a pen, not a pencil.───那是钢笔而不是铅笔。

Look around you. Is there something small, like a pen or something that you can pick up?───看看你的周围，有像笔之类的你可以捡起来的小东西吗？