英语中，that is, that is to say, namely 都是插入语，意为“也就是说”，用来对前文进一步补充和解释。

I am 22. That is (to say), I was born in 1993.  我今年22岁了，也就是说，我是1993年出生的。

They left two weeks ago, that is (to say), on July 27. 他们是两星期前，也就是7月27日走的。

That is to say, we must win this game.  也就是说，我们必须赢的这场比赛。

That is to say, the context of each word is collected, along with the word itself. 这也就是说，每个单词都是与这个词的上下文是一起收集的。

They are not common friends; that is (to say), they have special relation. 他们不是普通朋友，也就是说，他们有着特殊的关系。

That is to say, toys have no age and even species limits! 也就是说，玩具没有年龄限制，甚至也没有物种限制。

That is to say we still have different views. 也就是说，我们仍然有不同的看法。