单词：free-form surface
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April 18, 1906, California's San Andreas Fault snaps, shaking San Francisco for nearly 60 terrifying seconds .When the trembling stops, the disaster is only beginning. Gas lines rupture, setting off massive fires, some 700 people die. Most of the ci
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Section 45 Swimming etc. The crawl, the backstroke, the breathstoke and the butterfly, what are these? They are the different strokes we can use when swimming. There are others, but these are the main
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By Paul Sisco Washington 20 April 2007 NASA is preparing to launch a mission to the mesosphere, a region at the top of Earth's atmosphere where mysterious night shining clouds are formed. Little is known about the mesosphere, but its unique ice clou
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But about 3.5 billion years ago something more emphatic became apparent. 但是，大约在35亿年前，更加坚强的东西变得显而易见。 Wherever the seas were shallow, visible structures began to appear. 只要哪里的海水很浅，可见
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Idiom: Scratch the surface ( something superficial ) Hit the book: Complimentary Partial Pajama Long haul flight Tip the scale Well heeled Inaugural Flagship Lingering perception Free snacks, beer and wine: US airlines are trying harder to win back A
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