Exciton is electron - hole pair held together by their mutual Coulomb interaction.激子就是由电子和空穴在相互间的库仑力作用下,相互维持在一起的电子 -- 空穴对.As to the emission at 370 nm, It'should result from exciton recombination radiation.而在370nm处的...
Today I went to see my penfriend in Hongye Hotel.今天去红叶宾馆见我的笔友.I have not received any message from my penfriend for almost half an year.我已经大约半年没接到我笔友的消息了....
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.胞嘧 啶 核苷:当胞嘧啶通过β - 糖苷键与D- 核糖接合形成的核苷.Cytidine ( cytosine nucleoside ) A NUCLEOSIDE formed when cytosine is linked ...
Politicians want a lap-dog press which will uncritically report their propaganda.政客们想要的是不问是非、甘为他们搞宣传的哈巴狗一样的新闻媒体。Politicians say it could lead to a dissolution of parliament.政客们说这可能会导致议会解散。Politicians have debased the mea...
怪我粗心忘了关门。It was careless of me to leave the door open.你真粗心,把你姐姐的生日都给忘了.It was thoughtless of you to forget your sister's birthday.这个差错完全是由于粗心造成的.The error was due to carelessness pure and simple....
He howled like a wounded animal as blood spurted from the gash.当血从伤口中喷出时，他像一只受伤的动物一样嚎叫起来。There was an inch-long gash just above his right eye.就在他右眼的上方有一条一英寸长的伤口。Nick had a large gash on his cheek.尼克的脸颊上有一道很大很深的伤口....