1. Problems occur only if a contradiction develops between a new observation, say, "That ball is blue", and the preexisting statements. 只有当一个新的观察，比如“那个球是蓝色的”，与已有的陈述之间产生矛盾时，才会出现问题。
2. The event itself may be seen as either ex nihilo or order from preexisting chaos. 事件本身可以被看作要么不可得的虚无要么来自现有混沌的法则。
3. But what about preexisting code? 但是，对于现有的代码，应该怎么办呢？
4. Assume client1 changes the password for a preexisting user 'u100'. 假设客户端1更改了预先存在的用户“u100”的密码。
5. They allow you to mix in a wide variety of preexisting functionality. 它们可以让您坐享各式各样的现成功能。
