A: a mental or behavioural disorder is characterized by a disturbance in thinking, mood, or behaviour, which is out of keeping with cultural beliefs and norms.

答：精神或行为障碍的特征是思维、情绪或行为出现紊乱，与文化信仰和规范不一致。

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Experts said he was suffering from a severe behavioural disorder with psychopathic tendencies.

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The advice also stresses the need to make sure that children take medicine for conditions such as attention deficit hyperactivity disorder or for behavioural problems on the trip.

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It is believed that sleep deprivation may harm neurological development and can contribute to behavioural problems including attention deficit hyperactivity disorder (ADHD).

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