You cannot clap with one hand.
孤掌难鸣
(ɡū zhǎnɡ nán mínɡ)
A: Did you hear about that? Wang Xiang's company is brankrupt.
A: 你听说了吗?王翔的公司倒闭了。
(nǐ tīnɡ shuō le ma? wánɡ xiánɡ de ɡōnɡsī dǎobì le.)
B: Really? It's the first time I heard about it.
B:是吗?我第一次听说。
(shì ma? wǒ dìyīcì tīnɡshuō.)
A: Only Wang Xiang himself was working hard for that company. You know, you cannot clap with one hand.
A: 那家公司就王翔一个人在努力,孤掌难鸣啊。
(nà jiā ɡōnɡsī jiù wánɡ xiánɡ yīɡèrén zài nǔlì, ɡū zhǎnɡ nán mínɡ ā.)