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科学60秒:存在钻石星球?
Imagine climbing diamond mountains, or hiking around the graphite shores of a lake of tar. Sound a little sci-fi? Well a new discovery suggests planets like that might be out there—planets with...
短文:科学理论
科学理论Scientific Theories In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model that helps scientists picture...
背诵美文——火力发电厂
Coal-fired Power PlantsThe invention of the incandescent light bulb by Thomas A. Edison in 1879 created a demand for a cheap, readily available fuel with which to generate large amounts of electr...
晨读美文055
晨读美文It is commonly believed that only rich middle-aged businessmen suffer from stress. In fact anyone may become ill as a result of stress if they experience a lot of worry over a long peri...