Ideally, the string of characters should have a substring such as error or something similar (see the statement in bold blue), which will allow the tester to quickly find the error in the output file.

较理想的做法是，字符串有一个如error或与之相似的子串(见蓝色粗体的语句)，这个子串允许测试者很快地在输出文件中查找到错误。

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Attempting to continue reading past the end of the file in this way doesn't cause an error, but returns an empty string.

在过了文件末尾之后，如果还用这种方式继续读取，并不会造成错误，只会返回空的string。

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