5 sentences

1. 他是鉴定古董的行家。

   tā shì jiàn​dìng gǔ​dǒng de háng​jiā.

   He is an expert in authenticating antiques.

   Source: Dong Chinese Dictionary

2. 这幅画经鉴定后被证实是赝品。

   zhè fú huà jīng jiàn​dìng hòu bèi zhèng​shí shì yàn​pǐn.

   The painting was confirmed to be a forgery after appraisal.

   Source: Dong Chinese Dictionary

3. 专家正在对这件古董进行鉴定。

   zhuān​jiā zhèng​zài duì zhè jiàn gǔ​dǒng jìn​xíng jiàn​dìng.

   Experts are conducting an appraisal of this antique.

   Source: Dong Chinese Dictionary

4. 你为什么不告诉我DNA鉴定的事？

   nǐ wèi​shén​me bù gào​su wǒDNA jiàn​dìng de shì?

   Why didn't you tell me about the DNA test?

   Source: OpenSubtitles

5. 为了保险起见，他请专家鉴定这张古钞的真假。

   wèi​le bǎo​xiǎn qǐ​jiàn, tā qǐng zhuān​jiā jiàn​dìng zhè zhāng gǔ​chāo de zhēn​jiǎ.

   To be safe, he asked an expert to authenticate this ancient banknote.

   Source: Dong Chinese Dictionary