9. We are competitive in our excellent after-sale service.
我们有非常卓越的售后服务。
还能这样说：
We provide good customer service.
We have sound customer service.
10. What is your after-sale service hotline?
你们的售后服务热线是什么？
还能这样说：
Can you tell me the after-sale service hotline?
Do you mind telling me the telephone number of the after service?
应用解析：
pay lip service 耍嘴皮
11. The company provides after service free of charge.
公司提供免费的售后服务。
还能这样说：
The back-up service is free in the company.
There is no charge for the after service in the company.
应用解析：
take service 参与，服役
12. The after service lasts for one year.
售后服务的时间是一年。
还能这样说：
We guarantee one year's after service.
We provide the after service in one year.