Seventy protesters were killed by indiscriminate gunfire.是什么意思？

Seventy protesters were killed by indiscriminate gunfire.

70 名抗议者被乱枪射杀。

seventy

n. 七十，从七十到七十九的数目、年数或温度；

例句
The country has been battered by winds of between fifty and seventy miles an hour.
该国遭受到时速高达50至70英里的大风袭击，破坏严重。

Protesters

n. 抗议者( protester的名词复数 )，反对者，拒绝者，断言者；

例句
Among the protesters and war veterans proudly displaying their medals was Aubrey Rose...
在抗议者和骄傲地展示勋章的退伍老兵中，就有奥布里·罗斯。

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。

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

indiscriminate

adj. 不加选择的，不分青红皂白的，随意的，任性的，任意的，眼内无珠，汗漫不可收拾；

例句
The indiscriminate use of fertilisers is damaging to the environment.
乱用化肥会破坏环境。

gunfire

n. 炮火，枪炮声，炮火声，[军]号炮；

例句
Their sleep is regularly disturbed by the sound of gunfire as criminal gangs settle their nightly accounts.
他们经常被黑帮每晚火拼的枪声所吵醒。