She bought a mechanical dog for her sister.是什么意思？

She bought a mechanical dog for her sister.

她为她的妹妹买了一只机械狗。

she

pron. 她，它；

例句
Her lover walked out on her after she had aborted their child.
她的情人在她打掉胎儿后甩了她。

bought

v. 购买，购得( buy的过去式和过去分词 )，做出牺牲以获得，够支付，买通；

例句
He bought two bottles of vodka on account.
他挂账买了两瓶伏特加酒。

mechanical

adj. 机械的，机械学的，呆板的，体力的，手工操作的；

例句
...a mechanical digger.
挖掘机

dog

n. 狗，蹩脚货，丑女人，卑鄙小人；v. 困扰，跟踪；

例句
He dropped his sausage on the pavement and someone's dog ate it, mustard and all.
他把香肠丢在人行道上，不知是谁家的狗将香肠甚至连带芥末都吃个了精光。

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。

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。

sister

n. 姐妹，（称志同道合者）姐妹，修女，护士；adj. 姐妹般的，同类型的；v. 如姐妹般相待；

例句
My sister still claims she cheated on us at cards, but I know better.
我妹妹仍然说她和我们玩牌的时候捣了鬼，其实我心知肚明。