The witness at the trial had been carefully primed by defence lawyers.是什么意思？

The witness at the trial had been carefully primed by defence lawyers.

被告律师对出席审讯的证人事先作了仔细的指导。

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

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

witness

n. 目击者，见证人，[法]证人，证据；vt. 出席或知道，作记录，提供或作为…的证据；vi. 做证人，见证；

例句
There is a new witness to back his claim that he is a victim of mistaken identity.
有新的目击证人证明他的说法，他是被错认了。

at

prep. （表示位置）在，在（某时间或时刻），以，达， 向，朝；n. 阿特（老挝辅币单位，100 阿特 = 1 基普）；

例句
Prices start at £13.95 a metre for printed cotton...
印花棉布以每米13.95英镑的价格起售。

trial

n. 试验，[法]审讯，审判，磨难，困难，[体]选拔赛；adj. 试验的，[法]审讯的；

例句
Arbitrary arrests and detention without trial were common.
随意逮捕和拘留屡见不鲜。

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。

been

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的过去分词 ），在，存在，不受干扰，去过了，be的过去分词；

例句
Have you been able to have any kind of contact?...
你联系上了吗？

carefully

adv. 小心谨慎地，警惕地，仔细地，周密地；

例句
All through lunch he had carefully avoided the subject of the house.
整个午饭期间，他一直在小心翼翼地回避房子的话题。

primed

待发的；

例句
Claire wished she'd primed Sarah beforehand...
克莱尔真希望她事先指点过萨拉。

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

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

defence

n. 辩护，防御，防御工事，后卫；

例句
There was a general acceptance that the defence budget would shrink.
人们普遍相信国防预算将会缩减。

lawyers

n. 律师，法学家( lawyer的名词复数 )；

例句
His lawyers are arguing that he is unfit to stand trial...
他的律师正在提出理由说明他不适合出庭受审。