He owned a gun for scaring off intruders.

他有一支枪，用来吓走入侵者。

He was shot this morning by unidentified intruders at his house.

他今天早晨在家里遭到身份不明的闯入者枪击。

Sometimes a sudden shift in color can be used to startle potential predators or threaten intruders.

有时候，色彩的快速变换可以用来惊吓掠食者或威胁入侵者。

Intruders might invade your systems for one of two reasons: to gain access to information that they should not have or to alter the behavior of a system.

入侵者入侵您的系统可能是出于这两个原因之一：为了获取他们本不应该拥有的信息，或者为了改变系统的行为。

Any intruders will trip the alarm.

任何非法入室者都会触响报警器。