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When the invariant and variable behaviors are mixed together in the subclass implementation of the method, the invariant behaviors will repeat in the subclass. We move these behaviors to a single place through the template method pattern.However, we need to pay attention to the fact that Some "chains" are doomed not to contain "certain rules", just as some "checkpoints" are inherently unable to have certain functions. For example, "checkpoints A" are only responsible for attacking land enemies and have no air defense capability, while "checkpoints B" are only responsible for attacking air enemies and have no ability to defend infantry. "Checkpoints C" may be NB, which can defend both air defense and land enemies. "Checkpoints D" are the best and can defend both land and sea.她对阿里道：随他们杀去，我们走。Not bad, although it's over--Note: example is the database for testing, and the corresponding Example_log. Ldf is the log file for testing众人听了都忍不住笑。