take on sth: to begin to have a particular quality, appearance, etc.
呈现，具有（特征、外观等）：
Lisa's voice took on a more serious tone.
莉萨说话的语气变得严肃起来。
His words suddenly took on a different meaning.
他的话突然弦外有音了。
The car suddenly seemed to take on a life of its own (= move by itself without anyone controlling it).
那辆汽车突然自动开了起来。

(have) a life of its own: (of an object) seeming to move or function by itself without a person touching or working it
（指某物）（具有）生命力，可以自行活动：
When he was painting, he said, the brush used to take on a life of its own and take him in directions he never intended to go.
他说，在作画时，画笔仿佛具有生命力，带领他到意想不到的地方。