Dinosaurs
美音、自然拼读、分级阅读与词汇复习
How do we know dinosaurs lived on Earth?
我们怎么知道恐龙生活在地球上?
Scientists discover fossils in rocks all over the world.
科学家在世界各地的岩石中发现了化石.
Studying fossils helps them learn about dinosaurs.
研究化石有助于他们了解恐龙.
They study what dinosaurs looked like, where they lived, and what they ate.
他们研究了恐龙的外形,生活的地方,以及吃什么.
Fossils are the remains of plants or animals from long ago that have turned to stone.
化石是由来已久的植物或动物的遗迹,已经变成石头.
Scientists have found many different types of dinosaur fossils, including bones, footprints, teeth, nests, and eggs.
科学家发现了许多不同类型的恐龙化石,包括骨骼,足迹,牙齿,巢穴和卵.
These scientists are excavating, or carefully digging, fossils out of the ground.
这些科学家正在从地上出土或仔细地挖掘出化石.
After recording information about the fossils, the scientists will wrap them to keep them safe.
在记录了有关化石的信息后,科学家们会把它们包起来,以保持它们的安全.
Then the scientists will take them to a museum.
然后科学家会带他们去博物馆
Scientists will study the fossils.
科学家将研究化石.
They’ll examine the shape and color of the fossils.
他们将检查化石的形状和颜色。
They’ll also consider where the fossils were discovered and how deep underground they were discovered.
他们也会考虑化石在哪里被发现,
Scientists can sometimes fit bone fossils together to form a complete skeleton.
科学家有时可以将骨化石放入一起形成完整的骨架.
Most dinosaurs had hundreds of bones, so it is difficult to find all of them.
多数恐龙有上百个骨头,所以很难找到它们的全部.
Scientists use other dinosaur skeletons to help them piece together the fossils and understand the missing bones.
科学家利用其他恐龙骨架帮助他们把化石拼凑在一起,并了解所缺的骨头.
Although dinosaurs are extinct, the skeletons of other animals help scientists understand dinosaur skeletons.
虽然恐龙已经灭绝,但其他动物的骨架帮助科学家理解恐龙骨架.
Some dinosaur bones may be bigger than those of animals alive today.
有些恐龙骨可能比今天活生生的动物大.
However, many are still shaped the same.
然而,许多人的形状仍然相同。
Many different types of dinosaurs roamed Earth.
许多不同类型的恐龙在地上漫游.
Scientists study fossils to learn how dinosaurs moved around.
科学家研究化石 来了解恐龙是如何移动的
Some dinosaurs walked on two or four legs, and some used wings to fly.
有的恐龙以两四条腿行走,有的用翅膀来飞行.
As dinosaurs moved around Earth, they left tracks behind.
随着恐龙环绕地球移动,它们留下了足迹.
Scientists study fossil footprints to learn how fast or slow dinosaurs moved.
科学家研究化石足迹,以了解恐龙移动多快或慢.
Footprints also give clues about how big or small the dinosaur leaving the tracks might have been.
足迹还给出了恐龙离开足迹可能大小的线索.
Scientists study fossil teeth to learn about the diets of dinosaurs.
科学家研究化石牙齿以了解恐龙的饮食.
Many dinosaurs grew new teeth to replace those they had worn down or lost.
许多恐龙长出新牙来取而代之的是已经磨损或丢失的.
Some dinosaurs had razor-sharp teeth that helped them cut through meat or plants.
有些恐龙有剃须刀尖的牙齿,帮助它们切出肉类或植物.
Others had flat teeth that they used to grind their food.
还有的牙齿扁平,用来磨取食物.
Scientists learn about dinosaur babies from fossil nests and eggs.
科学家们从化石巢和卵上了解了恐龙宝宝.
Dinosaur eggs came in many different shapes and sizes.
恐龙蛋的形状和大小各不相同.
Some dinosaurs laid over twenty eggs at a time, while others laid only a few eggs.
有的恐龙一次产下20个蛋,有的只产出几个蛋.
Like birds, some dinosaurs may have sat on their nests until their eggs hatched.
和鸟类一样,一些恐龙可能一直坐在巢上直到卵孵出.
Scientists find fossils of plants, fish, insects, and other animals in the same rocks as dinosaur fossils.
科学家在与恐龙化石相同的岩石中发现了植物,鱼类,昆虫等动物的化石.
These fossils help them learn what Earth was like when dinosaurs lived here.
这些化石有助于他们了解恐龙住在这里时地球是什么样.
It’s also easier for scientists to find the age of the other fossils than dinosaur fossils.
除了恐龙化石, 科学家们也更容易找到其他化石的年代。
The other fossils are more complete than dinosaur fossils.
其他化石比起恐龙化石更完整.
They’re also found more often.
更经常地发现它们。
Scientists can estimate the age of dinosaur fossils based on the age of the other fossils.
科学家可以根据其他化石的年代估计出恐龙化石的年代.
Scientists can do tests to determine the age of fossils.
科学家可以进行测试以确定化石的年代.
Older fossils are found in rocks deep in the ground.
更古老的化石被发现于地上深处的岩石中.
Newer fossils are discovered in rocks closer to the surface.
较新的化石被发现于更接近地表的岩石中.
The oldest dinosaurs lived around 230 million years ago.
最早的恐龙生活在2.3亿年前左右.
Scientists aren’t sure how or why dinosaurs disappeared 65 million years ago.
科学家并不知道恐龙是如何消失的,
Studying dinosaur fossils helps scientists look for clues to understand what happened.
研究恐龙化石有助于科学家寻找线索来了解所发生的事.