behavior

n.[U]

1. 行為，舉止；態度
   He was on his best behavior.

   他表現極好。

2. （機器等的）運轉狀態，性能
   The aircraft's behavior was satisfactory on its first test flight.

   那架飛機在第一次試飛時運轉情況令人滿意。

3. （事物的）反應，變化；作用