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1·She was shocked at the slack discipline in the school.

对于学校松弛的纪律她感到震惊。

2·Discipline in the classroom is very slack.

班里纪律十分松懈。《牛津词典》

3·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。