Her art became a vehicle for her political beliefs...是什么意思？

Her art became a vehicle for her political beliefs...

艺术成了她表达政治信仰的工具。

her

pron. (she的宾格)她，(she的所有格)她的，她，指某个国家，（一艘）船；

例句
There was a terrible sadness in her eyes...
她眼神中流露出深深的悲伤。

art

n. 艺术，艺术作品，（需要技术、工艺的）行业，文艺（包括绘画、雕塑、建筑、音乐、舞蹈、戏剧、文学等）；vi. thou art 即 you are,对一人讲话时用；adj. 艺术的，（为）艺术家的，艺术品的，具有艺术性的；vt.& vi. [口语]（把…）装饰得古色古香，（把…）装饰得古怪而有艺术趣味，把…装饰得有艺术价值，把…加以艺术乔装，使艺术化[仅用于 art up 短语中]；

例句
When not producing art of his own, Oliver was busy advancing the work of others.
奥利弗在不搞自己的艺术创作时，就会忙着帮助别人完成作品。

became

v. 变为，成为（ become的过去式 ）；

例句
It became very clear that the incident was not just an aberration, it was not just a single incident.
事实已经很清楚，这件事不是偶发的，它并不是一起孤立的事件。

vehicle

n. 车辆，交通工具，手段，工具；

例句
A soldier was arrested after running amok with a vehicle through Berlin.
一名士兵在疯狂飙车穿越柏林后被逮捕。

for

prep. 为，为了，倾向于，关于，当作；conj. 因为，由于；

例句
I've come looking for a bit of advice.
我特来讨教。

political

adj. 政治的，政党的，对政治有兴趣的；

例句
He has also called for an acceleration of political reforms.
他同时呼吁加快政治改革的步伐。

beliefs

n. 信，信任（belief的复数形式）；

例句
He does not think that his beliefs make him any worse than any other man.
他觉得自己的信仰并不让他比其他人更邪恶。