long long ago,there were some animals,some strange and odd animals in 56000000 years of the world.For example,ambulocetus,dinosaurs and many ancient animals.But they have died out.很久很久以前,在5600万年前的世界有许多动物,有许多稀奇古怪的动物.比如陆行鲸,恐龙还有许多远古时代的动物,但是他们现在已经灭绝了哦，我没有看懂。请解释一下好吗？谢谢，再加上一句But scientists try to use mosquitoes find dinosaur DNA to revives them但是科学家们正尝试着用蚊子找到恐龙DNA去复活他们

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正在学新概念，才学到13课，不过那个那些单词是以前问过老师的。