鲨鱼（学名：Selachomorpha；英文名：Sharks）是软骨鱼纲、鲨形总目动物的统称，共有8目34科约548种。 体呈长纺锤形。 鳃裂侧位，胸鳍正常，不与吻的前缘愈合；鳍翅背位；歪 … Sharks can rouse fear and awe like no other creature in the sea. Find out about the world's biggest and fastest sharks, how sharks reproduce, and how some species are at risk of extinction. 金山词霸致力于为用户提供高效、精准的在线翻译服务，支持中、英、日、韩、德、法等177种语言在线翻译，涵盖即时免费的AI智能翻译、英语翻译、俄语翻译、日语翻译、韩语翻译、图片翻译、文档翻 … Sharks are cartilaginous fish with diverse shapes, sizes, and diets, inhabiting all oceans and playing crucial roles in marine ecosystems. There are over 400 shark species worldwide. Learn how WWF protects sharks from threats like overfishing and habitat loss.