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...
We classify most male singers as tenors, baritones and basses according to their registers.大部分男歌手根据音域分为男高音 、 中音和男低音.It is necessary initially to classify the headaches into certain types.首先，必须将头痛分为几个类型。We classify editor...
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...