……比登天还难。(……bǐ dēng tiān hái nán.)It is more difficult to do something than going to the outer space; very difficult to do something.
The literal meaning of “……比登天还难” is that it is more difficult to do something than going to the outer space. It metaphorically means it is extremely difficult to do something.
1、Jiǎ: Yàobu wǒmen qù wèn Lǐ Míng jiè diǎnr qián?
A: Why don’t we ask Li Ming to borrow some money?
Yǐ: Nǐ hái bú tài liǎojiě, zhǎo tā jièqián bǐ dēngtiān hái nán.
B: You don’t him well. It is more difficult to borrow money from him than going to the outer space.
2、Jiǎ: Míngtiān wǒmen kāichē guòqù ma?
A: Will we drive there tomorrow?
Yǐ: Nàlǐ zhǎo gè tíngchē de dìfāng bǐ dēngtiān hái nán, háishì dǎdí ba.
B: It’s extremely difficult to find a parking place there. We’d better go by taxi.