教科书上的始祖鸟插图，它是首次出现的鸟类，生活在1.5亿年前。
Textbooks say Archaeopteryx, which lived some 150 million years ago, was the first bird.
这些结确证了无数化学教科书中的插图，而且也符合量子力学的预测。
The structures verify illustrations seen in thousands of chemistry books because they match established quantum mechanical predictions. Source: insidescience.org
教科书有很多形象的插图也很有趣。
The textbook is also interested with lots of vivid illustrations.
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