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—...
Johnstone's research is admirably wide-ranging.约翰斯通的研究涉猎很广，让人钦佩。For seven employees, the Johnstone's re - launch offered a fantastic opportunity.约翰斯通再造品牌同时为七个公司雇员提供了千载难逢的好机会.The board of directors must surely h...
They wash their hands, arms and faces, and lastly, they wash their feet.他们洗了手、胳膊和脸，最后脚也洗了。Thank you to Jim Sheppe for drawing the maps. And lastly, a very big thank-you to Tony, William, Deborah and Bethan.多谢詹姆·谢泼绘制的地图。最...
The noise pollution survey revealed a rather spurring and possibly amusing old fashioned source of noise.这个有关噪音的污染调查还揭示了一种出人意外而同时可能会引人意外而同时可能会引人发笑的老式噪音源.Only 16 per cent of young women in a 1990 survey considered themsel...
...armed incursions into border areas by rebel forces.叛军武装入侵边境地区Dikes protected the lowland from incursions of the sea.堤防保护低地免于海水流入.Enemy forces have made incursions into our territory.敌军已入侵我国领土.Rumors of danger and war ...