Such is the case in pyrrole, thiophene, and furan.吡咯, 噻酚和呋喃的情况就是这样.It'shows that the key step is the synthesis of 4 - methyl - dihydro - furan - 2 , 3 - dione.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.A novel furan resin w...
语言发展的关键期是在幼儿期.The critical period of language development in early childhood.良好的幼儿期教育很重要, 这一点不言而喻.It's a no - brainer, of course , that high - quality child care is important.幼儿期的成长相当快.Growth is rapid in infancy....
We spent a happy evening reminiscing about the past.我们一晚上回忆往事，感到很愉快。I don't like reminiscing because it makes me feel old.我不喜欢追忆往事，因为那会让我感觉变老了。The old man sits in wonder while reminiscing about his youth.老人诧异地坐在那儿,回...