They were told to shoot enemies at sight.是什么意思？

They were told to shoot enemies at sight.

他们奉令一见到敌人立即射击。

they

pron. 他/她/它们，人们，大家，政府，当局，她们；

例句
The storms had abated by the time they rounded Cape Horn.
他们绕过合恩角时，暴风雨已经减弱。

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。

told

v. 表明( tell的过去式和过去分词 )，讲，知道，讲述；

例句
She came in for a coffee, and told me about her friend Shona...
她进来喝了杯咖啡，并向我谈起了她的朋友肖纳。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

shoot

vi. 拍摄，射击，发芽；vt. （用枪等）打猎，拍摄，给…注射，射门，投篮；n. 幼苗，嫩芽，发射，摄影，狩猎；int. 感叹词（用于表示惊奇，并不强烈的愤怒或失望）；

例句
He would rather shoot himself than compromise his principles.
他宁愿一枪打死自己也不愿违背自己的原则。

enemies

n. 仇敌( enemy的名词复数 )，敌军，危害物，大

例句
Old enemies can become new friends even if all their national interests are not in complete accord.
即使国家利益不尽相同，他们也可以化敌为友。

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。

sight

n. 视力，看见，视野，景象；vt. 看见，发现，瞄准，观察，调准瞄准器；vi. （用仪器）瞄准，观察；

例句
There are places you can take physically handicapped children where staff don't blanch at the sight of a wheelchair.
有些地方你能带残疾儿童去，那里的工作人员不会一看到轮椅就退缩。