Lack of food and water provided much of the impulsion for their speed.缺少食物和水促使他们加快了速度。Under the impulsion of its screw the " Resolute'sailed down the Thames.决心号在暗轮的推动下向泰 晤 士河驶去.I love the regretless youth but not th...
There is a smouldering anger in the black community.在黑人社区里，人们的心中都揣着一团怒火。A number of buildings around the Parliament were still smouldering today.国会周围的一些大楼今天还在冒烟。Whole blocks had been turned into smouldering rubble.整座整座的街...
另两个为胸腺嘧啶和胞嘧啶, 即称为嘧啶的单环结构.The other two, thymine and cytosine, are single ring structures called pyrimidines.嘌呤为嘧啶取代或嘧啶为嘌呤所取代,叫做颠换.The substitution of a purine for a pyrimidine, or vice versa is a transversion.本文研究氟脲嘧啶(5—...