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Even among the fish there are great differences in colour, size and shape. The smallest fish, the goby, is only one and a half centimetres long while the largest fish, the whale shark, is over 15 metres long. The weight of fish can range from a few grams to about 900 kilograms. Most fish only live for a few months to a year. Although fish are so different, they have certain common features. All of them have special organs that help them to live in water. These special organs are fins and gills. The fins help the fish to swim in water. They also help the fish to steady and steer itself as it moves through the water. The gills are com-like structures on either side of its head. The fish breathes by swallowing water and passing the water over the gills. The gills absorb the oxygen from the water. The water then comes out of the openings on the sides of its head. These openings have covers, called gill covers, over them. Most fish also have air-bladders. These help the fish to float. All fish have a line on either side of their bodies.
即使是鱼类，颜色，大小和形状都存在很大的不同之处。最小的鱼，虾虎鱼，只有1.5厘米长，而最大的鱼，鲨鱼，超过15米长。鱼的重量可以从几克到900千克。很多鱼只能在几个月到一年里生存。 虽然鱼有很多不同之处，但他们也有共同的特征。所有的鱼都有特别的器官来帮助它们在水里生活。这些特别的器官是鳍和鳃。 这些鱼鳍能帮助鱼在水里游泳。它们能帮助鱼在水中更加稳定和操纵自己。鱼鳃在鱼头两边的其中一边。鱼通过鱼鳃吞水和吸水来呼吸。鱼鳃从水里吸入氧气。然后水从头部另外一边出来。这些开口有遮盖物，叫做鳃盖。 很多鱼都有空气的囊状物。这可以帮助鱼漂浮在水面。所有的鱼在它们的身体上都有一条线。 ——By lsy34