恐龙研究专家认为，现代鸟类直接起源于手盗龙类，其他已灭绝的恐龙现在被称之为“非鸟恐龙”。

Modern birds are direct descendants of Maniraptoran dinosaurs, experts say. The creatures that went extinct millions of years ago are now called "non-avian dinosaurs."

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例如，如果没有恐龙的灭绝，我们这些哺乳动物就不会有机会繁荣昌盛。

For instance, if it hadn't been for the extinction of the dinosaurs, we mammals would never have had an opportunity to flourish.

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为什么科学家们想要了解更多关于恐龙灭绝的信息？

Why did scientists want more information about the dinosaur extinctions?

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