天文学家能够测定每颗恒星的亮度。An astronomer can determine the brightness of each star.星星的光亮度各不相同.Stars vary in brightness.用18瓦的荧光灯灯泡有同样的亮度，而用电量却减少75％。With an 18-watt fluorescent bulb you get as much light but use 75% less electricity....
No, it's an interphone system. You'll have to dial 0 first.不可以, 是内线电话, 你得先拨0.Please keep pushing the interphone.请连续按对讲机.Then, two security personnel ask to reinforce to the security department with interphone i...
由于大雨,伊利湖水正在上涨.Lake Erie is filling with the heavy rain.1970年工业废物污染了克利夫兰附近的伊利湖湖面.Industrial waste burned on the surface of Lake Erie near Cleveland in 1970.共有五个大湖泊: 苏必利尔湖, 密歇根湖, 休伦湖, 伊利湖和安大略湖.There are five lakes: Superio...
As a member of the nobility,his life had been one of wealth and privilege.身为贵族中的一员,他过着有钱有势的生活。Being neither jealous nor greedy, being without desires, and remaining the same under all circumstances, this is nobility.不嫉妒、...
饮用水;挥发性卤代烃;氯仿;四氯化碳.Study on the levels of volatile halogenerated hydrocarbon in drinking Linyi City.摘要研究了碳酸铯催化酚与卤代烃反应制备烷基芳醚.Cesium carbonate catalyzed O - alkylation of phenol to synthesize alkly aryl ethers.此外, 芳基硼酸与卤代烃...