现实告诉我们：梦想就要行动，行动就要坚持。

Reality tells us: the dream is about to action, must insist on.

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然而，现实告诉我们，许多人做着自己喜欢的工作，但却并不清楚自己“真正”的目标是什么。

Yet reality shows us that there are plenty of people doing work they love who have no clue what their "true" purpose is.

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设计时不得不添加文本符号的现实告诉我们，无论程序员采取什么样的构造方式，用户采用的都是不同的心理模型。

The fact that the designers had to add that text legend tells me that, regardless of how the programmers constructed it, the users were applying a different mental model.

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But one of the teaching fellas also passed long to us recently, a little real world example of what happens when you're not mindful of various data types and you're not mindful of the imprecision that's inherent in representing data in a computer, at least using a language like C and low level primitives like floats and even doubles.

最近有个助教告诉我们，一个现实世界中的例子,当你不注意各种各样的数据类型,也不注意在计算机中表示数据时,其内在的不精确性，至少在用像C语言,和float甚至double型数据时，那将会发生什么？

哈佛公开课 - 计算机科学课程节选