Fish are cold-blooded like reptiles and amphibians. They can’t control their body temperature.
鱼是冷血的，就像爬行动物和两栖动物一样。他们无法控制自己的体温。
Fish are vertebrate animals that live in the water. Vertebrate means they have a spinal cord surrounded by bone or cartilage.
鱼类是生活在水中的脊椎动物。脊椎动物意味着他们有一个被骨头或软骨包围的脊髓。
Fish have gills that extract oxygen from the water around them.
鱼有鳃，从它们周围的水中获取氧气。
Fish are vertebrates. That means they have a backbone. But unlike mammals, fish don’t have lungs. They breathe by taking oxygen from the water in through their mouths, where it passes over the gills. The gills then absorb oxygen from the water and send the oxygen throughout the body. Some fish are carnivores. They eat other fish and small animals and insects. Other fish are omnivores, eating both plants and animals.
鱼是脊椎动物。这意味着他们有一个脊梁骨。但与哺乳动物不同的是，鱼没有肺。他们通过嘴从水里吸氧（最终到达腮）来呼吸。鳃从水中吸收氧气并将氧气输送到全身。有些鱼是食肉动物。他们吃其他鱼类、小动物和昆虫。其他鱼类是杂食动物，吃植物和动物。
There are over 30000 known species of fish.
世上有30000多种已知鱼类。
Fish have a good sense of taste, sight and touch. They can feel pain.
鱼有很好的味觉、视觉和触觉。他们能感觉到疼痛。
The largest fish is the great whale shark. It can grow to 50 feet long. The tiny Philippine goby is about the size of your pinky fingernail.
最大的鱼是大鲸鲨。它可以长到50英尺长。小小的菲律宾虎鱼大约和你的指甲一样大。
Some flatfish use camouflage to hide themselves on the ocean floor.
有些比目鱼用伪装来隐藏在海底。
Tuna can swim at speeds of up to 70 kph (43 mph).
金枪鱼可以以70公里每小时的速度游泳（43英里每小时）。
Relative to their body size, fish have small brains compared to most other animals.
相对于他们的体型，鱼和其他大多数动物相比，大脑都很小。
Fish are covered in scales which are often covered in a layer of slime to help their movement through water.
鱼全身都有鳞片覆盖，鱼鳞通常会覆盖在一层粘液中以帮助它们在水中移动
Cleaner fish help out other fish by removing parasites and dead skin from their scales.
清洁鱼通过去除鱼鳞中的寄生虫和死皮来帮助其他鱼类。
Although jellyfish and crayfish have the word ‘fish’ in their name, they aren’t actually fish.
虽然水母（海蜇）和小龙虾的名字都包含“鱼”字，但它们实际上不是鱼。
Over 1000 fish species are threatened by extinction.
超过1000种鱼类正面临灭绝的危险。
Mermaids are mythological creatures with the tail of a fish and the upper half of a woman.
美人鱼是神话中的生物，她有一个鱼尾巴和一个女人的上半部。
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