What do you mean by pre-and post-cases?

The meanings of the early and late stages of this case are as follows:

1. Pre-service mainly refers to the property maintenance of the developer's sales office. Common services include water bar service, cleaning service and security service.

2. Post-property service refers to the property service activities jointly carried out with the owners' committee to maintain the normal operation of the owners and the services of normal equipment and facilities after the delivery of the house.