“大批杀害”常见的英文表达是 “massacre”（作动词时） ，也可表述为 “kill in large numbers” 或 “slaughter in large quantities” 等。具体示例如下：
Massacre（动词）：
The rebels massacred the entire village. 叛军屠杀了整个村庄的居民。
Kill in large numbers：
The dictator ordered his troops to kill innocent civilians in large numbers. 这位独裁者命令他的部队大批杀害无辜平民。
Slaughter in large quantities（“slaughter” 本身有“大屠杀；大量屠杀”之意 ）：
The invading army slaughtered people in large quantities during the war. 入侵的军队在战争期间大批杀害百姓 。