可再入的函数可以被安全地递归调用或由多任务多次调用。

A reentrant function can be safely called recursively or from multiple tasks.

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如果你想让你的规则变成可再入的，那闭包就是必须的了。

Closures are needed if you need your rules to be reentrant.

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适当地结合规划-跟踪算法和航迹角控制器可给再入制导带来极大的灵活性和适应性。

Proper combination of planning-tracking algorithm and FPA controller can bring great flexibility and adaptability to reentry guidance.

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