Because it says, your program will still give you a value, but it may not be what you intended, and you can't always tell, and that may propagate it's way down through a whole bunch of other computations before it causes some catastrophic failure.

因为这意味着，你的程序依然会返回一个值，但是这个值可能不是你想要的，你可能还分辨不出来，而且这种情况会传播,结果会沿着正果计算过程传播下去,直到产生一个灾难性的错误。

麻省理工公开课 - 计算机科学及编程导论课程节选

OK, so what else do I have then in my little class definitions here?

你需要重新计算其他的值,来让保证不出现错误？

麻省理工公开课 - 计算机科学及编程导论课程节选

And in terms of using these equations in solving problems on the exam, and also using these constants, make sure if you think there might be any chance you're going to get any little part of a problem wrong or do a calculation inaccurately, you need to write out every single step of your thinking as you write out these problems.

而当你在考试过程中用这些公式,来解题时，加上运用这些常数，如果你觉得有可能,在某一小问上出错,或者出现计算错误，请务必把你的思路一步一步地都写出来,当你在答题的时候。

麻省理工公开课 - 化学原理课程节选

Right, it's a syntactic error, because it doesn't know how to deal with this.

好，这是个语法错误，这是因为计算机不知道怎么来解释着个。

麻省理工公开课 - 计算机科学及编程导论课程节选