Because the course of action they took turned out badly, they believe that the opposite course—keeping Mother at home, postponing the operation—would have turned out better.
因为他们采取的行动结果很糟糕，他们认为相反的做法——让母亲呆在家里，推迟手术——会有更好的结果。
Keeping track of sessions can be an expensive operation, especially as you grow beyond one server.
跟踪会话是一种成本很高的操作，尤其是在涉及多个服务器的情况下。
You can maintain backward compatibility by creating a new operation based on the old one and keeping both in the interface.
可以通过基于旧操作创建新操作，并同时保持两个接口来保持向后兼容性。
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