In addition, hackers can use people's screen names without their knowledge.
除此之外，黑客也可以在用户不知情的情况下盗用别人的用户名。
It can be directed against enemy countries or even "friendly nations", without their knowledge.
它能够被导向敌国或者甚至是“友邦”而不为其所知。
Only those who could withstand this assault without disavowing their knowledge were admitted.
只有那些不否定自己的知识被公认并经得起这种攻击的人会获得胜利。
They do it without the knowledge or help or their parents.
他们跟异性约会时，他们的父母连知道都不知道，也插不上手来帮帮忙。
They do it without the knowledge or help of their parents.
这样做既不让父母知道也不要父母的帮助。
They never open their mouths without subtracting from the sum of human knowledge.
他们一张口，人类的知识就会受损失。
They never open their mouths without subtracting from the sum of human knowledge.
他们一张口，人类的知识就会受损失。
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