unknown error是未知错误的意思。
unknown是未知的意思；
error是错误的意思。
unknown error常见于程序运行当中出现错误时提示。
unknown error的例句：
1、An unknown error occurred in HTML help.
html帮助中发生未知错误。
2、We were not able to validate your e-mail account at this time due to an unknown error.
由于一个未知的错误，我们现在无法验证您的电子邮件帐户。
3、An Unknown error occurred trying to display this item.
试图显示此项目时出现未知错误。
4、There was an unknown error uploading this file.
上载此文件时遇到未知错误。
5、An unknown error has occurred while attempting to verify this secure receipt.
尝试确认该安全收条时出现未知错误。
