He urged anyone traveling to the border cities of Tijuana and Ciudad Juarez to be cautious.

VOA: standard.2009.04.12

That means it was something I didn't understand. So I'm going to be cautious and systematic.

这就意味着代码中有一些,我没有理解的东西，因此我需要谨慎,并且系统化的去寻找这个错误。

麻省理工公开课 - 计算机科学及编程导论课程节选