Question

请用英语介绍一下“鱼”

Answer 1

A fish is a water-dwelling vertebrate with gills that doesn't change form,as amphibians do,during its life.Most are cold-blooded,though some (such as some species of tuna and shark) are warm-blooded.There are over 29,000 species of fish,making them the most diverse group of vertebrates.Taxonomically,fish are a paraphyletic group whose exact relationships are much debated; a common division is into the jawless fish (class Agnatha,75 species including lampreys and hagfish),the cartilaginous fish (class Chondrichthyes,800 species including sharks and rays),with the remainder classed as bony fish (class Osteichthyes).
翻译：鱼鳃是一种形式,不改变水生脊椎动物,如两栖动物一样,在其生命.大部分是冷血动物,但一些国家（如金枪鱼和鲨鱼某些物种）是温血动物.有超过29,000种鱼类,使他们成为最多样化的脊椎动物群体.在分类上,鱼是一个系群,其确切的备受争议的关系,划分为一个共同的jawless鱼（类无颌类,75种七鳃鳗和盲鳗等）,软骨鱼（类软骨鱼类,其中包括800种鲨鱼和鳐鱼）,与其余的归为硬骨鱼（类硬骨鱼）.