1. 那就是说,换句话说：thanks to 由于,多亏,幸亏 | that is to say 那就是说,换句话说 | that is 就是说;即(略为i.e)
2. 也就是说：节省体力 save one's strength | 也就是说 that is to say | 为某事责备某人 scold sb. for sth.
3. 换句话说：I say, do you have the time?我说,你有时间吗?(用于发话之前引起注意) | that is to say换句话说 | you can say that again.没错用来表示完全同意前面说过的话
4. 即, 就是, 换句话说, 就是说 更确切地说：removal efficiency 排除效率 | that is to say 即, 就是, 换句话说, 就是说 更确切地说 | selenite [矿]透明石膏,[化] 亚硒酸盐