There are multiple definitions - click on the translation that matches your context.

电脑系统被攻击

名词

full

breach

noun

Definitions of breach

a gap in a wall, barrier, or defence, especially one made by an attacking army

They held back the enemy despite the breach of a critical gate.

a serious disagreement or break in relations between people, groups, or countries

Article 45 deals with the breach of relations between States.

an act of unauthorized entry into, or corruption of, information stored on computer, especially by a hacker or as part of a cyber attack

The company has taken further measures to protect customer data since the breach.