一旦找到错误，它必须指出错误的真实原因，最好是提供人们能够理解的错误消息。
When it finds a mistake, it must point to the true reason for it, preferably with an error message that humans understand.
一个类和一个接口不同：一个类可以有它形态的真实实例，然而一个接口必须至少有一个类来实现它。
A class and an interface differ: a class can have an actual instance of its type, whereas an interface must have at least one class to implement it.
黄济人解释道，这本书是为了警示后人而写的，要做到这一点，就必须保证它的客观和真实。
The book was to be written with an eye to posterity, and only objectivity and truth could ensure that, Mr. Wang said.
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