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英语名词变复数，以f结尾的怎么加s？chief, thief, handkerchief, gul以f 或fe结尾变复数时直加s的名词占少数，我汇集了13个（其他须变为ves或两种形式都行的统统暂时归. Ceo：首席执行官（chief executive officer，缩写ceo）。 coo：首席运营官（chief operating officer ，缩写 coo ，营运长）。 cfo：首席财务官 (chief financial officer，缩.

I don't think it's unusual or controversial. There may be many reasons/factors regarding a certain topic. Competitors may be the main reason/factor, hence: