There was a print statement that wrote to the screen, and an input statement that read from a keyboard, but there was no way to redirect IO to or from a file.
abc里有一个print语句，可以让你在屏幕上输出，还有一个input语句，让你可以从键盘上读入，但是ABC却没有办法可以把IO重定向到文件，或者从文件重定向到IO。
There's no need to print error messages for this case since file descriptors 0 through 2 are only closed if an attacker is trying to subvert your program.
在这种情况下不需要输出错误消息，因为文件描述符 0 到 2 只是在攻击者试图去搅乱您的程序的时候才会被关闭。
'Print To file' was selected, but no filename was entered.
指定的输出文件无效。输入其他文件名。
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