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tooth 还是teeth?

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tooth 还是teeth?
Instead of tooth, the blue whale has a row of bony plates in its mouth that functions as a food-collecting device.
要帮我讲讲为什么哦 谢谢
tooth 还是teeth?
teeth更合适,因为后有复数a row of bony plates 与之对应.单独用都可以.