一言難盡 yī yán nán jìn

Chinese 101: How to say "It's hard to explain!"
Grammar: Chinese numbers in idioms
Language Tips: How to avoid answering nosy questions in Chinese

Dialogue:

A：你現在做什么工作？
Nǐ xiàn zài zuò shén me gōng zuò ？
What do you do now?

B：這個嘛，不是三言兩語就能說清楚的。
Zhè gè ma, bù shì sān yán liǎng yǔ néng shuō qīng chǔ de.
Well... It's not easy to explain this clearly in just a few words.

A：你有對象了嗎？
Nǐ yǒu duì xiàng le ma？
Are you dating someone?

B：一言難盡！
Yī yán nán jìn ！
It's hard to explain in a few words!

Words & expressions:

【現在】xiàn zài: now
【工作】gōng zuò：job, work
【三言兩語】sān yán liǎng yǔ：in a few words
【清楚】qīng chu: clear
【對象】duì xiàng: object ; partner; girlfriend or boyfriend
【一言難盡】yī yán nán jìn: hard to explain in a few words

Source: goeastmandarin.com
Editor: wanwan