"people / police / cattle
These collective nouns always take a plural verb. There is no singular form of these noun." (from BBC)
"The word cattle is plural -- it is a collective term for more than one bovine, be it a cow, heifer, bull, or steer (or any or all of these)." (from answers.com)
从小就学到 cattle 本身就是复数, 也不像 fish 那样可以被说成 fishes, 所以唯一的可能就是你那本书的编辑偷懒或眼残了 :P
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