Definition: to help customers and sell things to them in a shop Level: B1
我可以为您服务吗？
Can I ___serve you?
我还学到了很多关于如何服务顾客以及如何使用收银机的知识。
I also learnt a lot about how to ___serve customers and how to use a till.
她每个周末在超市为顾客服务。
She ___serves customers at the supermarket every weekend.
