4 sentences

1. 海关人员正在查验旅客的行李。

   hǎi​guān rén​yuán zhèng​zài chá yàn lǚ​kè de xíng​li.

   Customs officers are inspecting passengers' luggage.

   Source: Dong Chinese Dictionary

2. 警方正在对案发现场进行勘验，不放过任何线索。

   jǐng​fāng zhèng​zài duì àn​fā xiàn​chǎng jìn​xíng kān yàn, bù fàng​guò rèn​hé xiàn​suǒ.

   The police are conducting a forensic investigation of the crime scene, leaving no stone unturned.

   Source: Dong Chinese Dictionary

3. 医生建议他去化验室验血。

   yī​shēng jiàn​yì tā qù huà​yàn​shì yàn xuè.

   The doctor recommended that he go to the lab for a blood test.

   Source: Dong Chinese Dictionary

4. 请出示您的证件以验明身份。

   qǐng chū​shì nín de zhèng​jiàn yǐ yàn míng shēn​fèn.

   Please present your ID to verify your identity.

   Source: Dong Chinese Dictionary