She was shocked at the slack discipline in the school.

对于学校松弛的纪律她感到震惊。

Discipline in the classroom is very slack.

班里纪律十分松懈。

He noticed at once that discipline was slack: the Danes had the self-confidence of conquerors, and their security precautions were casual.

他马上发现丹麦军纪松弛，他们以征服者自居，安全措施马马虎虎。