政治:俄克里姆林宫呼吁大幅削减警察数量
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科学60秒:透镜效应:揭开古老星系面纱
Five very old galaxies are now known to astrophysicists, thanks to Albert Einstein. A century ago, Einstein predicted an effect called cosmic gravitational lensing. Picture a massive galaxy out i...
背诵美文——电
ElectricityThe modern age is an age of electricity. People are so used to electric lights, radio, televisions, and telephones that it is hard to imagine what life would be like without them. Wh...
背诵美文——创造颜色
Creating ColorsThere are two ways to create colors in a photograph. One method, called additive, starts with three basic colors and adds them together to produce some other co
鲨鱼入侵!
bbcWhat do you expect when you go on holiday? Probably to relax, have a good time andabove all, stay safe. Sometimes natural disasters, such as a hurricane or an erupting volcano, may puta st...