n.[U]
1. 行为,举止;态度
He was on his best behavior.
他表现极好。
2. (机器等的)运转状态,性能
The aircraft's behavior was satisfactory on its first test flight.
那架飞机在第一次试飞时运转情况令人满意。
3. (事物的)反应,变化;作用