单词:
单词: 相关文章
By Carolyn Presutti Washington 07 December 2007 CT scans, also known as CAT scans, have long served as lifesaving tools to expose deadly diseases. But a new study finds that CT scans might also cause diseases. VOA's Carolyn Presutti has the story. C.
Kelvin died in 1907. That year also saw the death of Dmitri Mendeleyev. Like Kelvin, his productive work was far behind him, but his declining years were notably less serene. As he aged, Mendeleyev became increasingly eccentriche refused to acknowled
今天我们要学的词是hazard。 Hazard, 是危害,危险的意思。混合动力车虽然有利于环保,但是低速行驶时几乎没有声音,对盲人的安全构成威胁, Hybrid vehicles pose a safety hazard for the blind. 最近,有
今天我们要学的词是hazard。 Hazard, 是危害,危险的意思。混合动力车虽然有利于环保,但是低速行驶时几乎没有声音,对盲人的安全构成威胁, Hybrid vehicles pose a safety hazard for the blind. 最近,有
WASHINGTON, March 30 (Xinhua) -- A trace amount of radioactive(辐射性的) iodine(碘) has been found in a sample of milk from the west state of Washington, the U.S. Environmental Protection Agency and the Food and Drug Administration (FDA) sai