In computer security, any weakness or flaw existing in a system, the susceptibility of a system to a specific threat attack or harmful event, or the opportunity available to a threat agent to mount that attack. 在計算機安全學中，存在於一個系統內的弱點或缺陷，系統對一個特定的威脅攻擊或危險事件的敏感性，或進行攻擊的威脅作用的可能性。
The condition or state in which human beings exist in a meaningless, irrational universe wherein people's lives have no purpose or meaning. Used chiefly with the. 無價值，無意義人類生存在一個無意義或非理性世界的情況或狀態下，在那裡人類的生活既無目的又無意義。主要與the連用
The universe exists in space. 宇宙存在於太空。
The question of how many souls exist in heaven is academic. 天堂里有多少靈魂這一問題純屬空談。
