"底细" refers to the exact details of a person or a matter, and it also means inside information.
例句 Sentences
1、下个月就要结婚了,可她还摸不清未婚夫的底细。 Xià gè yuè jiù yào jiéhūn le, kě tā hái móbùqíng wèihūnfū de dǐxì. She is going to get married next month, but she has not known the exact background of her fiancé.
2、经过两周的调查,警方终于摸清了这个开发商及其楼盘的底细。 Jīngguò liǎngzhōu de diàochā, jǐngfāng zhōngyú mōqīng le zhège kāifāshāng jíqí lóupán de dǐxì. After two weeks' investigation, the police have had the details of this property developer and his buildings.