I apologise for not forwarding the message sooner, but due to a typing error your mail was returned marked "user unknown".

很抱歉没有尽早转发这封邮件，但是由于拼写错误，您的邮件以“用户身份不明”被退回。

youdao

Runtime environments provide capabilities that are driven by some unknown user code; that makes it impossible to predict which resources the runtime environment will require in every situation.

运行时环境提供由一些未知用户代码驱动的功能；这使得无法预测运行时环境在各种情况下需要哪些资源。

youdao

The dialog box identifies the unknown recipient by name, so that the user can take corrective action.

这个对话框中还标识出了未知接收者的名字，这样用户就可以采取适当的操作了。

youdao

Classifying users according to their roles takes the unknown out of user access equation.

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