在编程中，循环结构用于重复执行一段代码，直到条件不再满足。
Show the answer and explanation
Correct answer
B. 终止
Principle or equation
循环结构的基本概念：循环会持续执行，直到终止条件不再满足。
Why this answer is correct
循环结构有循环条件和终止条件，当终止条件满足时循环结束。因此“终止”最合适。
Example
在for循环中，当循环变量达到上限时，终止条件满足，循环结束。
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