He had emerged from being a hesitant and unsure candidate into a fluent debater.是什么意思？

He had emerged from being a hesitant and unsure candidate into a fluent debater.

他从一个吞吞吐吐、缺乏自信的候选人成长为口若悬河的辩论者。

he

pron. 他，它，一个人；n. 雄性动物；

例句
Logic had prevailed and he had abandoned the idea.
最终理智占了上风，他打消了那个念头。

had

v. 有（ have的过去式和过去分词 ），（亲属关系中）接受，拿，买到；

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

emerged

v. 出现( emerge的过去式和过去分词 )，露头，形成，事实；

例句
We struck up a conversation, in the course of which it emerged that he was a sailing man.
我们聊了起来，在谈话过程中得知他是一名水手。

from

prep. （表示时间）从…，（表示原因）因为，（表示来源）来自…，（表示分离）与…分离[隔开]；

例句
...an abortive attempt to prevent the current President from taking office.
企图阻止现任总统连任的失败尝试

being

n. 存在，生物，人，要素，本质；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

hesitant

adj. 踌躇的，犹豫的，迟疑的，吞吞吐吐的；

例句
He had emerged from being a hesitant and unsure candidate into a fluent debater.
他从一个吞吞吐吐、缺乏自信的候选人成长为口若悬河的辩论者。

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

unsure

adj. 不确定的，缺乏信心的，无把握的，不稳定的，不可靠的；

例句
I thought from the first that she was a little unsure about that marriage.
从一开始我就觉得她对那桩婚事心里没底。

candidate

n. 候选人，应试者，申请人，被认定适合者；

例句
The candidate stands accused of breaking promises even before he's in office...
该候选人还未上任就遭指责违背诺言。

into

prep. （表示方向）进入…中，（表示所属）输入，（表示状态）进入…状态，（表示时间）持续到；

例句
By 1838, the abolitionists had shamed parliament into ending slavery in British colonies...
到1838年，废奴主义者迫使议会出于道德压力而废除了英国殖民地的奴隶制。

fluent

adj. 流畅的，流利的，液态的；

例句
I remain to this day fluent in Hebrew, while my Arabic is atrocious...
时至今日，我的希伯来语仍很流利，但阿拉伯语却糟透了。

debater

n. 讨论家，讨论者；

例句
The debater refused to cede the point to her opponent.
辩论者拒绝向她的对手放弃其主张.