实现这些替换或修改的方式必须不影响用户，还要确保用户得到正确的身份验证。
The replacement or modification must be implemented in a way that doesn't affect users and also ensures that users are properly authenticated.
在正确的位置得到正确的事务行为，无需修改调用者或目标方法中的任何代码。
You get the right transactional behavior, in the right place, without modifying any code in the caller, or the target method.
如果它们发现参数是正确的，那么就将执行下面的操作：添加、修改或删除照片或评论。
If they find parameters that look applicable, they will do an operation: add, modify, or delete an image or a comment.
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