无巧不成书(wú qiǎo bù chéng shū)What a coincidence!

Explanation

“无巧不成书”的意思是一部书中总是有许多巧合，这样才能构成一个精彩的故事。比喻事情十分凑巧。
“无巧不成书” means that there are always many coincidences in a book, so as to create a good story. It is an analogy for something that occurs very coincidentally.
Words:

好心人hǎoxīn rén:good-hearted person;
伞sǎn:umbrella;
书shū:book.

Sentences

1.Jiǎ：Zhè ge xīn lái de tóngshì jiù shì shàng cì xià yǔ shí jiègěi wǒ sǎn de hǎoīnrén.
甲：这个新来的同事就是上次下雨时借给我伞的好心人。
A: My new colleague is the good-hearted person who lent me an umbrella when it was raining.

Yǐ：Wú qiǎo bù chéng shū a!
乙：无巧不成书啊！
B: What a coincidence!

2.Jiǎ：Zhè běn shū de jiéjú yǒu nàme duō de qiǎohé ，tài jiǎ le.
甲：这本书的结局有那么多的巧合，太假了。
A: The ending of the book has too many coincidences. It feels too fake.

Yǐ：Shēnguó zhōng yě yǒu hěn duō wú qiǎo bù chéng shū de shì ā!
乙：生活中也有很多无巧不成书的事啊!
B: There are also many coincidences in our daily lives.