Twelve British servicemen were killed yesterday.是什么意思？

Twelve British servicemen were killed yesterday.

昨天十二名英国军人被杀。

twelve

num. 十二，十二个，十二点钟，十二岁；adj. 十二的，十二个的；n. 十二；十二个；

例句
In most jurisdictions, twelve jurors and two alternates are chosen...
大多数辖区都会选出12名陪审员和2名候补陪审员。

British

adj. 不列颠的，英国的，英国人的，英国英语的；n. （总称）英国人，英国英语；

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。

servicemen

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例句
Twelve British servicemen were killed yesterday.
昨天十二名英国军人被杀。

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。

killed

adj. 被杀死的，断开的；v. 杀死( kill的过去式和过去分词 )，使停止[结束，失败]，破坏，减弱，抵消，使痛苦，使受折磨；

例句
Six passengers were killed in the accident.
六名乘客在车祸中丧生。

yesterday

n. 昨天，往昔，<正式>过去；adv. 在昨天，在昨日，近来；

例句
A police investigation yesterday absolved the police of all blame in the incident.
警方昨天的调查廓清了其在此事件中的任何责任。