But there were also worries because some data systems used the digits 9999 to mark the end of a file.

可是，也有一些忧虑是出自一些使用数字9999标记文件结束的数字系统。

youdao

But there were also worries because some data systems used the digits 9999 to mark the end of a file.

可是，也有一些忧虑是出自一些使用数字9999标记文件结束的数字系统。

youdao