that is to say什么意思解释？

Education Ministers ought to have placed the interests of consumers — that is to say pupils first.教育部长们应该把服务对象——也就是学生—的利益放在首位。I pointed out several mistakes and carefully repeated my original instruction; that is to say,...

that is to say的音标：that is to say的英式发音音标为：[ðæt iz tu: sei]that is to say的美式发音音标为：[ðæt ɪz tu se]...