the way that someone behaves

Her behaviour is often appalling. 她的行为举止常常糟糕之极。

He was notorious for his violent and threatening behaviour. 他因暴力和威胁行为而声名狼藉。

the way that a person, an animal, a substance, etc. behaves in a particular situation or under particular conditions

His research involved the study of instinctive behaviour in birds. 他的研究是关于鸟类本能行为的。

These behaviours can be observed among many children who have lost a parent or other loved one. 这类行为可能出现在失去了父母或亲人的儿童身上。