Her maternal grandfather was Mayor of Karachi.是什么意思？

Her maternal grandfather was Mayor of Karachi.

她的外公是卡拉奇市的市长。

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。

maternal

adj. 母亲的，母亲般的，母系的，母亲方面的；

例句
Genetic abnormalities are more often associated with faults in paternal DNA than in maternal DNA.
相对于母本DNA,基因畸变往往更多地与父本DNA上的缺陷相关。

grandfather

n. （外）祖父，始祖；vt. 新规定限制，不受新条例；

例句
His grandfather was a Muslim cleric.
他的祖父是一名穆斯林阿訇。

was

v. 用来表示某人或某物即主语本身，用来表示某人或某物属于某一群体或有某种性质（ be的过去式 ），在，存在，不受干扰；

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

mayor

n. 市长，镇长，（英格兰、威尔士和北爱尔兰由议员选举产生的）镇长，（民选的）市长；

例句
For his dedication the Mayor awarded him a medal of merit.
为表彰他的奉献精神，市长授予他荣誉奖章。

of

prep. 关于，属于…的，由…制成；aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气]；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

Karachi

n. 卡拉奇；

例句
I'll try to get on the flight down to Karachi tonight...
我尽量赶上今晚去卡拉奇的航班。