吡咯, 噻酚和呋喃的情况就是这样.Such is the case in pyrrole, thiophene, and furan.研究结果表明关键步骤为原料 4- 甲基 -2, 3- 呋喃二酮的合成.It'shows that the key step is the synthesis of 4 - methyl - dihydro - furan - 2 , 3 - dione.用糠醇和糠醛缩聚制备了新型呋喃树脂.A n...
Sybil quizzed her about life as a working girl.西比尔询问了她当女工的生活。The woman I regarded as my fairy godmother was Sybil. She was wonderful to me.被我视为贵人的女子叫西比尔。她待我好极了。"It sounds the most fearful hard work," Sybil said later.“这听...
这一封来函,一封去信,轮流地在他桌上妆点着.These two pieces of incoming and outgoing mail alternately adorned his desk.你们二人轮流地看守这位病人.You two will stay with the sick person by turns.每个学生都轮流地读那首诗.Each of the pupils in turn read the poem aloud....
A handful of onlookers stand in the field watching.少数几个旁观者站在现场观看。Steve barely said a handful of words during the first half hour.史蒂夫在前半小时里没说几句话.The band are playing a handful of shows at smaller venues.乐队要在小一点的场馆举办几场演出。...
Pigeons fluttered in and out, cooing gently.鸽子们低声咕咕地叫着，扑扇着翅膀飞进飞出。the sound of pigeons cooing鸽子咕咕的叫声The boy frightened away the pigeons from the roof.那男孩把屋顶上的鸽子吓飞了....