换句话说。（Huàn jù huà shuō.）In other words.

Explanation

这个短句常作为插入语放在句首或句中，指换一种方式来进一步解释别人不明白的或者是之前说过的话。
This phrase is often used as a parenthesis, which appears at the beginning or in the middle of a sentence. It introduces another way to explain the answer to the question or interpret what one has just said before.
Words:

解释jiěshì:explain;
枕头zhěntou:pillow.

Sentences

1、Wǒ juéde nǐ děi zhùyì zìjǐ de yánxíng, huàn jù huà shuō,nǐ zuìjìn jīngcháng shuō cuò huà bàn cuò shì.
我觉得你得注意自己的言行，换句话说，你最近经常说错话，做错事。
I think you must pay more attention to your words and deeds because lately you often say or do something wrong.

2、Jiă:Lǎoshī shuō tāshì gè xiùhuā zhěntou, shénme yìsi?
甲：老师说他是个绣花枕头，什么意思？
A: Teacher said he is just a pillow with an embroidered cast. What does that mean?

Yǐ: Huàn jù huà shuō, jiùshì lǎoshī juéde tā xué de bùhǎo,dǒng de tài shǎo.
乙：换句话说，就是老师觉得他学得不好，懂得太少。
B: A pillow with an embroidered cast, in other words, means his understanding is too shallow and he needs to know more.