You were an unknown quantity, Mr. President.

当时您的情况还无法预料 总统先生。

You are an unknown quantity, and this is not personal.

你是个未知数 这不针对个人。

The class was quiet as it entered the room; Professor Umbridge was, as yet, an unknown quantity and nobody knew how strict a disciplinarian she was likely to be.

全班同学走进教室时都默不作声，乌姆里奇教授还是个未知数，谁也不知道她对于课堂纪律的要求有多么严格。

He lifted his head and looked to the south, reminding himself that the maker summoned wild from the erg was an unknown quantity, and the one who summoned it was equally unknown to this test.

他抬起头看向南方，提醒自己从尔格召唤狂野的制造者数量不详， 而召唤它的人在这次测试中同样不为人知。