The first mistake that nonnative speakers make is to return a value indicating an error, instead of throwing an exception.

非原生语言使用者的第一类错误是返回一个表示错误的值，而不是抛出异常。

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This paper discusses the property of the indefinite integral, indicating an error in the proof of the textbook and giving a correction.

本文指出了高等数学教科书中，不定积分的一个线性性质的条件及其证明的错误，并给出正确的证明。

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If you look at Figure 4 again, you'll see that the values are in red, indicating an error, even though the NFInput method associated with the NF button accepted the data.

如果再看一次图4，就会发现该值显示为红色，这指示了一个错误，尽管和NF按钮相关联的NFInput方法接受了该数据。

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