In his book Cosmos, the late scientist Carl Sagan talks about the way in which the earth is regularly struck by material from outer space.

已故科学家卡尔·萨根在著作《宇宙》中叙述了外太空物体如何有规律和地球发生碰撞。

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Confucius Homely Talks is a valuable material for studying Confucius and early Confucianism, but the long-standing skepticism as to the authorship of this book has checked its study.

《孔子家语》是研究孔子与早期儒学的宝贵材料，但由于长期以来该书“伪书”说的影响，人们对其价值仍然心存疑虑。

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As for the things and phenomena in this material world, he just talks as they are, and objectively observes and learns about them, never mix his own opinions.

物质世界之内的现象、事物，他只就事论事，客观地观察、了解，但是不掺杂自己的意见。

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New "Car Talks" will be assembled from archival material, the brothers wrote.

CNN: 'Car Talk' hosts retiring from hit show

See, everybody talks about how wonderful the convention speech was, but I tell people, I had good material to work with -- (laughter) -- good material.

WHITEHOUSE: Remarks by the First Lady at a Campaign Event

Everybody talks about the convention speech and how good it was, but I always say, I had good material to work with. (Laughter.) It was very easy.

WHITEHOUSE: Remarks by the First Lady at a Campaign Event