In each type, fish body may produce varied changes and form some appendages, such as oral disk, pelvic fin disk and thorax disk.

在各种类型中，鱼体上又有不同的形态结构产生。

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In each type, fish body may produce varied changes and form some appendages, such as oral disk, pelvic fin disk and thorax disk.

在各种类型中，鱼体上又有不同的形态结构产生。

youdao