Tā xuéle bùshǎo dōngxi, kě dōu shì sānjiǎomāo, yàngyàng bù jīng.
He's learned a lot of things, but he's a jack of all trades and master of none.
Wǒ zhè diǎn gōngfu shì sānjiǎomāo, zài zhuānjiā miànqián bù gǎn bān mén nòng fǔ.
My kung fu is strictly amateur; I wouldn't dare show off in front of experts.
