that is to say也就是说...in other words也就是说...this means that也就是说...Three days from now , that is to say Friday.三天之后,也就是说星期五In other words, we have adhered to scientific socialism.也就是说,我们坚持了科学社会主义。This means that you enjoy having a good time.也就是说,你喜欢玩得快乐。