YangBin啊啊
What is a Shark?Sharks are a type of fish.Sharks are amazing fish that have been around since long before the dinosaurs existed. They live in waters all over the world, in every ocean, and even in some rivers and lakes. Unlike bony fish, sharks have no bones; their skeleton is made of cartilage, which is a tough, fibrous substance, not nearly as hard as bone. Sharks also have no swim bladder (unlike bony fish). ________________________________________MAJOR DIFFERENCES BETWEEN SHARKS AND BONY FISHATTRIBUTE SHARKS BONY FISHSkeleton Cartilage only Bones and cartilageSwimming Can only swim forward. Can swim forwards and backwardsBuoyancy (floating) Large oily liver Gas-filled swim bladderGills Gill slits but no gill cover Covered gill slitsReproduction Eggs fertilized in female's body. Eggs usually fertilized in the water.Skin Rough, sandpaper-like placoid scales Slippery, overlapping scalesSIZEA scuba diver above a Whale shark. The Whale shark is the largest fish in the world; the basking shark is the second largest fish.There are many different species of sharks that range in size from the size of a person's hand to bigger than a bus. Fully-grown sharks range in size from 7 inches (18 cm) long (the Spined Pygmy shark), up to 50 feet (15 m) long (the Whale shark). Most sharks are intermediate in size, and are about the same size as people, 5-7 feet (1.5-2.1 m) long. Half of the 368 shark species are under 39 inches (1 m) long. ________________________________________BODY SHAPESSharks have a variety of body shapes. Most sharks have streamlined, torpedo-shaped bodies that glide easily through the water. Some bottom-dwelling sharks (e.g. the angelshark) have flattened bodies that allow them to hide in the sand of the ocean bed. Some sharks have an elongated body shape (e.g., cookiecutter sharks and wobbegongs). Sawsharks have elongated snouts, thresher sharks have a tremendously elongated upper tail fin which they use to stun prey, and hammerheads have extraordinarily wide heads. The goblin shark has a large, pointed protuberance on its head; its purpose is unknown. ________________________________________VARIETIES OF SHARKSThere are about 368 different species of sharks, which are divided into 30 families. These different families of sharks are very different in the way they look, live, and eat. They have different shapes, sizes, color, fins, teeth, habitat, diet, personality, method of reproduction, and other attributes. Some types of shark are very rare (like the great white shark and the megamouth) and some are quite common (like the dogfish shark and bull shark). Sharks belong to the group of cartilagenous fish, the Elasmobranchii, that includes the sharks, rays, and skates.There are over 350 different species of sharks. The spiny dogfish shark is the most common shark
陌唯言Y
shark是一个英文单词 ，名词、动词，作名词时意为“鲨鱼；骗子”，作动词时意为“诈骗；敲诈”。
英读音[ʃɑːk]；美读音 [ʃɑːrk]。
第三人称单数： sharks.
复数： sharks.
现在分词： sharking.
过去式： sharked.
过去分词： sharked.
双语例句：
1。The shark described a circle around the shoal of fish.
这条鲨鱼围绕着鱼群游动。
2.The shark was writhing around wildly, trying to get free.
那条鲨鱼疯狂地扭动身体，试图挣脱。
3.Beware the sharks when you are making up your mind how to invest.
当你决定如何投资时要提防诈骗者。
4.The shark dived down and swam under the boat.
鲨鱼急速潜入水中，在船下游动。
5.Panic swept through the swimmers as they saw the shark approaching.
游泳的人看见鲨鱼靠近时一片惊慌。
6.The accursed shark alone can in any generic respect be said to bear comparative analogy to the dog.
就一般情况说来，只有那种可恶的鲨鱼，才可以说是具有跟狗相似的癖性。
7.Palau also established the world's first shark sanctuary in 2009.
帕劳在2009年时也建立了世界上第一个鲨鱼保护区。
8.Sharks have been around for a very long time.
鲨鱼已经存在很长时间了。
9.Shark attack about 100 people a year in America.
在美国,每年大约有100人受到鲨鱼攻击。
10.There are between 200 and 250 kinds of sharks in different size.
有200到250种不同大小的鲨鱼。
11.Here you will find different kinds of fishes and even some kinds of sharks.
在这里你会发现不同种类的鱼甚至鲨鱼。
12.A shark is a fish, but it has many differences from a fish.
鲨鱼是鱼类，但它又和鱼有许多不同。
13.It is said that one of the most dangerous sharks is the Great White Shark.
据说大白鲨是最危险的一种鲨鱼。
14.Australia, New Zealand and South Africa also have shark 0attacks.
澳大利亚、新西兰和南非也有鲨鱼袭击。
15.Sharks feed on fish, other sea animals, or smaller sharks.
鲨鱼以鱼、其他海洋动物或较小的鲨鱼为食。
