某处

zhè shǐ wú xiān sheng xiǎng qǐ le tā zài mǒu chù dú dào guo de dōng xi

这使吴先生想起了他在某处读到过的东西。

It reminded Mr. Wu of something he had read somewhere before.

dá àn yī dìng cáng zài mǒu chù

答案一定藏在某处。

The answer's here somewhere.