学习新编程语言的唯一方法就是用它编写程序。

Quality is not something you can add on to a product or service. It must be built in from the beginning.

如果你不知道，意见有什么用？

keep fit and don't lose your nerve.

勇气不是没有恐惧，而是尽管恐惧仍选择行动。

You see, in life, lots of people know what to do, but few people actually do what they know. Knowing is not enough! You must take action.

对于系统，翻版的模拟是在控制图中添加一个创建循环的边，而不仅仅是一个附加节点。