In there compounds, the cyclopentadiene ring has only four hydrogens.在这些化合物里, 环戊二烯环只有4个氢.Those that are aligned perpendicular to the plane are called axial hydrogens.与平面垂直定向的氢叫做直立氢.A methane molecule is composed of one c...
Beautiful butterflies hovered above the wild flowers...美丽的蝴蝶在野花上方飞舞。She hovered on the brink of death for three months as doctors battled to save her...3个月来她一直在死亡线上徘徊,而医生则在全力挽救她的生命。A hawk hovered in the blue sky.一只老鹰在蓝色的...
雍和宫. 它是北京最大也是保存最好的喇嘛庙.Yonghegong. It is the largest and best - preserved lamasery in Beijing.喇嘛庙? 我听说那里非常有意思.The Lama Temple? I've heard that was a very interesting place.B喇嘛庙? 我听说那里非常有意思.B The Lama Temple? I'v...
Scientists know that cancer may not show up for many years.科学家们知道癌症可能会潜伏多年。Decaffeinated coffee still contains some stimulants and other nasties linked with cancer.脱咖啡因的咖啡仍含一些刺激物和其他可能致癌的有害物质。She attended a cancer support...