fall victim to（成为…的受害者）中的 victim，不论主语是单数还是复数，都保持单数。
Having given up the protection of the British Empire's powerful fleet, American ships were falling victim to pirates from modern-day Morocco, Algeria and Libya. (Newsweek, April 28, 2008, p.26)美国的船只放弃了大英帝国强大舰队的保护，就陆续受到来自今天的摩洛哥、阿尔及利亚与利比亚的海盗的袭击。