If not for the break outer statement,there would be no way to get out of the outer loop from within an inner loop,since break by itself can break out of only the innermost loop.

• 如果没有break outer语句，就没有办法在一个内部循环里找到出外部循环的路径。这是由于break本身只能中断最内层的循环(对于continue同样如此)。