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Of course, in this century, uses for drones go far beyond war, to include surveillance, exploration, photography, racing. And one young inventor is hoping that smart drones will be able to navigate dangerous places, avoiding obstacles while searching

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The second day the four Aldens scraped and scraped the green moss from the bottom of the pool. Fortunately, it wasnt a very large area. Kay was pleased at how clean the empty pool looked. So pleased that she promised to have it filled with water the

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In so doing, I reached a frontier of biology so strange, so rich, 通过这样的方式，我来到一个非常古怪却又非常丰富的生物学领域， that it seemed as though it exists on another planet. 简直就像降临到别的星球一样。

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A Ten-Cent Idea When young F. W. Woolworth was a store clerk, he tried to convince his boss to have a ten-cent sale to reduce inventory. The boss agreed, and the idea was a resounding success. This inspired Woolworth to open his own store and price

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Well, after all, how odd! 好了，不管怎么说，你真够搞怪！ When one gives to poor people, one wants to give them something usefula bushel of potatoes, a ham, and such things. 如果想送穷人东西，送点实用的东西总是不错，比

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Where once only salt miners traveled, today, tourists trek(艰苦跋涉), through tunnels hundreds of feet deep into the caverns(大洞穴) of Zipaquir Mountain in Colombia. Their destination: a Catholic cathedral carved from the mineral deposits of

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When Dorothy presently asked him a question the Tin Woodman could not open his mouth, for his jaws were tightly rusted together. 当多萝茜跟他说话时，铁皮人却没有答话，因为他的嘴巴都牢牢地锈在一起了。 He became great

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Change Makes Life Beautiful（生命美于变化） To regard all things and principles of things as inconstant modes or fashions has more and more become the tendency of modern thought． Let us begin with that which is withoutour physical life． F

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In Japan, too, borrowers are scarce. 在日本，借钱的人也是几乎没有。 Private non-financial companies, which ought to play the role, have instead been lending to the rest of the economy, acquiring more financial claims each quarter than

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I was really moved by these experiences, 我被这些真实的故事深深打动了 and I decided that I wanted to write about them 我之前计划只是写一本书来记录 not only in a book I was working on, but also in an article, 但是现在我觉

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