单词：distance measurement with horizontal base staff
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Cells cannot remain alive outside certain limits of temperature and much narrower limits mark the boundaries of effective functioning. Enzyme systems of mammals and birds are most efficient only withi
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经典句型：It's very cool today.今天真凉快啊。 A:It's very cool today. 甲:今天真凉快啊。 B:Yes.Because it rained yesterday. 乙:是的，因为昨天下雨了。 A:Let's go to the park to enjoy the nice weather. 甲:天气这么好，
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Rho Ophiuchi dark cloud is one of the closest star-forming regions to our own solar system. Located near the constellations Scorpius and Ophiuchus, the nebula is about 407 light years away from Earth. The infrared astronomical satellite, now celebra
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Some bacteria have adapted to super cold environments for millions of years. And scientists have isolated some of the essential genes that allow bacteria to tolerate their harsh living conditionsbecause these same genes might help in the creation of
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