Phrase
that is to say
adverb
如下；也就是说
as follows
- 1.
as follows
如下
如下；(作插入语)那就是说；即是
In use
The meeting is postponed; that is to say, we will meet next Monday instead.
He is a vegetarian, that is to say, he does not eat meat or fish.
The store closes at nine, that is to say, you have one hour to shop.
..., that is to say, ...
插入于句中，前后通常有逗号。
He is a linguist, that is to say, someone who studies language scientifically.
他是一位语言学家，也就是说，研究语言科学的人。
That is to say, ...
用于句首，引出进一步解释或同义转述。
That is to say, we need to reconsider our approach.
也就是说，我们需要重新考虑我们的方法。
Common mistakes
That is say, he is not coming.That is to say, he is not coming.
英语中 'that is to say' 是固定短语，不能省略 'to'；直接说 'that is say' 不符合语法。
I am tired that is to say I need a break.I am tired; that is to say, I need a break.
'that is to say' 通常作为插入语，需要用逗号或分号与主句隔开，不能直接连接两个句子。
Connections
Dictionary facts from ECDICT, WIKTIONARY.