Animals with and without backbones.
有脊椎和没有脊椎的动物。
Bones give an animal its shape.
骨头赋予动物形状。
They help an animal move.
它们帮助动物移动。
Bones help to protect an animal.
骨头有助于保护动物。
Some animals have backbones and some do not.
有些动物有脊椎，有些没有。
Mammals, reptiles, amphibians, birds and fish have backbones.
哺乳动物、爬行动物、两栖动物、鸟类和鱼类都有脊椎。
Birds have wings and they can fly.
鸟有翅膀，它们能飞。
A flying squirrel does not have wings but it can glide like birds.
飞鼠没有翅膀，但它能像鸟一样滑翔。
Some animals have hard coverings or shells, not backbones.
有些动物有坚硬的覆盖物或外壳，而不是脊椎。
Insects do not have backbones.
昆虫没有脊椎。
They have hard coverings.
它们有坚硬的覆盖物。
The coverings help insects move and protect them.
覆盖物帮助昆虫移动并保护它们。
Insects have six legs.
昆虫有六条腿。
They can climb very well.
他们爬得很好。
Many insects can hop.
许多昆虫会跳。
A grasshopper can hop a very long way.
蚱蜢可以跳很远的路。
A grasshopper has wings.
蚱蜢有翅膀。
It can also fly.
它还会飞。
A crab does not have a backbone.
螃蟹没有脊梁。
It has a shell.
它有一个外壳。
The shell protects it.
外壳保护它。
A crab can swim like fish.
螃蟹能像鱼一样游泳。
Turtles are unusual animals.
海龟是不寻常的动物。
They have backbones and shells.
它们有脊椎和贝壳。