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—...
Scores of congratulatory telegrams and letters greeted Franklin on his return.富兰克林一回来，就收到了好几十封贺电和贺信。Telegrams expressing sympathy poured in from all parts of the country.全国各地纷纷打来了慰问电.I received two telegrams today.我今天收到了...
2,000 prisoners died as a result of torture and maltreatment.2,000名犯人死于拷打和虐待。There are consistent reports of electrical torture being practised on inmates.一直有报道称犯人被施以电刑。The confessions were obtained by what amounts to to...
猫看见那只狗时拱起了背.The cat arched her back when she saw the dog.猫看到狗,便把背拱起.The cat arches its back when It'sees the dog.那猫看见狗时就拱起了背。The cat arched its back when it saw the dog....
Temperature records have unequivocally confirmed the existence of global warming.气温记录清楚无疑地证实了全球气候正在变暖。Avoid muscle strain by warming up with slow jogging.先慢跑热热身，免得拉伤肌肉。Carl slipped a disc in his back while warming up.热身时...