Examples
yě jiù shì shuō也就是说，wǒ我gèng jiā更加de地liǎo jiě了解le了zhōng guó中国。
也就是说，我更加地了解了中国。
That's to say, I have a better understanding of the Chinese nation.
也就是说，他根本不想做。
In other words, he doesn't want to do it.
她不关心别人；也就是说，她很自私。
She doesn't pay attention to others; in other words, she is selfish.