Both his grandfathers were fired with an enthusiasm for public speaking.是什么意思？

Both his grandfathers were fired with an enthusiasm for public speaking.

他的祖父和外公都热衷于演说。

both

adj. 二者，两者都；pron. 二者；adv. 二者，二者都；conj. 不仅…而且…，…和…都；

例句
The gym can be used by both able-bodied and disabled people.
这家健身房健全和残障人士都可使用。

his

pron. (he的所有格)他的，(he的物主代词)他的东西；det. 属于他的，用于名词前，自己的，指某人的，上帝的；

例句
He claimed that his parents had abandoned him...
他声称父母遗弃了他。

grandfathers

n. （外）祖父( grandfather的名词复数 )；

例句
Both his grandfathers were fired with an enthusiasm for public speaking.
他的祖父和外公都热衷于演说。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

fired

v. 开火，射击( fire的过去式和过去分词 )，<口>解雇，射（箭），激励；

例句
Three people were killed by shots fired at random from a minibus...
3个人被从一辆面包车中发射的乱弹打死了。

with

prep. 和，跟，随着，关于，和…一致；

例句
A waiter entered with a tray...
侍者端着托盘进来了。

an

art. 一（在元音字母前代替不定代词a），一任一某一，一个；

例句
He started eating an apple...
他开始吃苹果。

enthusiasm

n. 热情，热忱，热衷的事物，宗教的狂热；

例句
I'm depressed by the bovine enthusiasm of the crowd's response.
人群毫无热情的迟钝反应使我感到很沮丧。

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。

public

adj. 公众的，公共的，公开的，政府的，人人知道的，知名的；n. 大众，社会，公共场所，（文学家等的）爱读者；

例句
The public never had faith in his ability to handle the job...
公众从来不相信他有能力胜任这一职位。

speaking

n. 说话，讲话，谈话，演讲；adj. 演讲的，富于表情的，（肖像）栩栩如生的，雄辩的；v. 讲，谈(speak的现在分词 )；

例句
The Prime Minister was speaking ahead of today's meeting.
首相在今天的会议开始之前作了发言。