1、也就是说
...that is 也就是说，即that is to say 也就是说the instant (that) 一…就 ...
2、也就是
...like that 那一类的(那样的...that is to say 也就是in that 因为，由于，既然...
3、换句话说
...last but not least 最后但同样重要的是moreover 而且;此外that is to say 即;就是;换句话说 ...
4、就是
...last but not least 最后但同样重要的是moreover 而且;此外that is to say 即;就是;换句话说 ...