Otherwise the test is always going to be true, we're going to go off here, but this would loop forever if I did that.

否则测试结果就会一直为真，我们需要离开这个测试，否则就会一直执行循环。

麻省理工公开课 - 计算机科学及编程导论课程节选

Having reached the end of the block, go back up and check the test.

执行到了这块代码的最后，程序会回去再做一次测试。

麻省理工公开课 - 计算机科学及编程导论课程节选

It's 1. Is it less than or equal to 16? Sure.

改变ANS，x不变，再去执行测试。

麻省理工公开课 - 计算机科学及编程导论课程节选