摘要：Sharks are fish, but their skeletons are made of cartilage（软骨） instead of bones. Cartilage is what gives human ears their shape. U

Shark 的作者是Kira Freed，本人在Mr. Herbert的协助下进行翻译，供大家进行双语阅读。

Sharks have lived in the oceans since before dinosaurs walked on Earth. There are more than 350 kinds of sharks, and they can be found all over the world.

鲨鱼属于鱼类，但它们的骨骼是由软骨而非骨头构成。软骨赋予了人类耳朵的形状。与大多数鱼类不同，鲨鱼的皮肤很粗糙。

Sharks have a very good sense of smell. They also see well in poor light. Sharks can sense when hurt animals are moving in the water.

鲨鱼的嗅觉非常灵敏。它们在弱光下也看得很清楚。当受伤的动物在水中移动时，鲨鱼能感觉到。

Sharks come in many sizes. Some sharks are only a few inches long. The whale shark is the largest fish in the world. Sharks have pointed noses and long, thin bodies that let them swim very fast.

鲨鱼体型也是多样的。有些鲨鱼只有几英寸长。鲸鲨是世界上最大的鱼。鲨鱼有尖尖的鼻子和细长的身体，这使它们游得很快。

Many sharks are dark on the top and light on the bottom. This color pattern makes it harder for other animals to see them.

许多鲨鱼的背部是深色的，肚皮部分是浅色的。这种颜色图案使得其他动物很难看到它们。

鲨鱼通过左右摆动尾巴来游动。鳍帮助鲨鱼控制方向、转弯并保持平衡。鲨鱼背部的背鳍有时会露出水面。

来源：陈星体育谈