1. check in [登记；报到]
[构成]:check[检查；核对] + in[在...里]
例句：You need to check in at the hotel before 6 p.m. [你需要在下午 6 点前在酒店办理入住手续。]

2. check out [结账离开；检验；合格]
[构成]:check[检查；核对] + out[出去；离开]
例句：They checked out of the hotel this morning. [他们今天早上结账离开了酒店。]

3. check up [检查；核对；调查]
[构成]:check[检查；核对] + up[向上；在...之上]
例句：You'd better go to the hospital to check up. [你最好去医院检查一下。]

4. check into [调查；登记入住]
[构成]:check[检查；核对] + into[进入]
例句：The police are checking into the case. [警方正在调查这个案子。]

5. check off [核对；逐一检查]
[构成]:check[检查；核对] + off[离开；去掉]
例句：Please check off the items on the list. [请逐一核对清单上的项目。]

6. check through [仔细检查；浏览]
[构成]:check[检查；核对] + through[穿过；通过]
例句：He checked through the report carefully. [他仔细检查了这份报告。]

7. double-check [再次检查；复核]
[构成]:double[双重的；两倍的] + check[检查；核对]
例句：It's important to double-check your work. [再次检查你的工作很重要。]

8. spot-check [抽查；抽样检查]
[构成]:spot[地点；斑点] + check[检查；核对]
例句：The quality control department will do spot-checks regularly. [质量控制部门会定期进行抽查。]

9. credit check [信用审查]
[构成]:credit[信用；信誉] + check[检查；核对]
例句：Before getting a loan, you may need a credit check. [在获得贷款之前，你可能需要进行信用审查。]

10. background check [背景调查]
[构成]:background[背景；后台] + check[检查；核对]
例句：The company will do a background check on new employees. [公司会对新员工进行背景调查。]

11. security check [安全检查]
[构成]:security[安全；保障] + check[检查；核对]
例句：Passengers have to go through security check at the airport. [乘客在机场必须通过安全检查。]

12. health check [健康检查]
[构成]:health[健康] + check[检查；核对]
例句：I have a health check every year. [我每年都进行健康检查。]

13. temperature check [体温检测]
[构成]:temperature[温度；体温] + check[检查；核对]
例句：They did temperature checks at the entrance of the building. [他们在大楼入口处进行体温检测。]

14. document check [文件检查]
[构成]:document[文件；公文] + check[检查；核对]
例句：The customs officer did a document check. [海关官员进行了文件检查。]

15. inventory check [库存检查]
[构成]:inventory[存货清单；库存] + check[检查；核对]
例句：We need to do an inventory check before the end of the month. [我们需要在月底前进行库存检查。]

16. quality check [质量检查]
[构成]:quality[质量；品质] + check[检查；核对]
例句：All products must pass the quality check. [所有产品都必须通过质量检查。]

17. regular check [定期检查]
[构成]:regular[定期的；有规律的] + check[检查；核对]
例句：The machine needs a regular check. [这台机器需要定期检查。]

18. random check [随机检查]
[构成]:random[随机的；任意的] + check[检查；核对]
例句：There will be random checks on students' bags. [会对学生的书包进行随机检查。]

19. pre-flight check [飞行前检查]
[构成]:pre-flight[飞行前的] + check[检查；核对]
例句：The pilots did a pre-flight check carefully. [飞行员仔细地进行了飞行前检查。]

20. final check [最后检查；终审]
[构成]:final[最后的；最终的] + check[检查；核对]
例句：This is the final check before the project is delivered. [这是项目交付前的最后检查。]