“侵入者”用英语怎么说

前舱里活象是被某种侵入者所激怒的一群狂暴的蜜蜂.The forecastle was like an angry hive of bees aroused by some marauder.非法侵入者行为相同,但出于恶意.Crackers do the same thing but for malicious purposes.这样的侵入者都是有效的竞争者.Such invaders are efficient competitors....