正确,that is的意思是“也就是”“换句话说”
补充：that is,只是一个插入语,它不是句子的成分,与其它任何句子成分都不发生语法关系.
一般情况下都是有逗号的,没有也不算错
I have some trouble,that is I can't find him and he will be
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