2 sentences

1. 我兄弟是个危险的万事通。

   wǒ xiōng​dì shì gè wēi​xiǎn de wàn​shì​tōng.

   My brother's a dangerous know-it-all.

   Source: OpenSubtitles

2. 他可是个万事通，什么难题都难不倒他。

   tā kě​shì gè wàn​shì​tōng, shén​me nán​tí dōu nán bù dǎo tā.

   He's a know-it-all; no problem can stump him.

   Source: Dong Chinese Dictionary