Several detainees had been summarily executed.是什么意思？

Several detainees had been summarily executed.

几个在押犯被草草处决。

several

adj. 几个的，专有的，各自的，分别的；pron. 几个，数个，一些；

例句
He's already altered several of the proposals in his economic plan to accommodate demands of special interests.
他已经改动了经济计划中的几项提议以迁就特殊利益集团的要求。

detainees

n. （尤指因政治原因而）被拘留者( detainee的名词复数 )；

例句
...the agreement worked out by the UN, under which all hostages and detainees would gain their freedom.
联合国拟定的恢复所有人质和被拘禁者人身自由的协议

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？

summarily

adv. 概括地，即刻地，简单（化）地，草率地；

例句
This article summarily reveals the development of the analyticity since Locke and Kant.
这一工作是对逻辑经验主义对洛克与康德以来的分析性概念的发展的准确表达.

executed

v. 执行（法令）( execute的过去式和过去分词 )，（按计划或设计）作成，履行，演（戏）；

例句
The whole cast executed the production with truly professional aplomb.
全体演职人员以一种真正的专业精神，从容不迫地开始了影片的制作。