通过延迟对appointment类的构建和初始化，简化了对附加包装行为(比如持久性)的分离。
By deferring construction and initialization to the Appointment class, I make it easier to separate additional wrapping behavior (such as persistence).
包装、网费、电费等这只是很基本的花销，如果卖家注重细节营销，一些附加包装成本便上来了。
Package, Internet, electricity etc. This is a basic expenses, if the seller pays attention to the details of marketing, some additional packaging costs will come up.
使用实际数据之上的包装脚本和元数据意味着，对于屏幕上任意的附加的字段，只有元数据需要添加到数据库中。
The use of the wrapper script and metadata over the actual data means that for any additional fields to the screens, only metadata needs to be added to the database.
应用推荐