recursively enumerable set

例句：

1. 1.This algorithm is designed to work recursively and efficiently.
   这个算法被设计成可以递归高效地工作。
2. 2.The recursive function calls itself in a loop until it reaches the base case.
   递归函数在循环中调用自身，直到达到基本情况。
3. 3. In mathematics, a recursive function is one that calls itself within its own definition.
   在数学中，一个递归函数是在一个定义内部调用自身的函数。