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.直到不久以前,人们对胸腺的功能尚不明了.The function of the thymus was unknown until relatively recently.动物的免疫系统由两个主要部分组成,即胸腺和骨髓系统.I...
我们的进度晚了两个月，而且已经超出了预算。We were two months behind schedule, and already over budget.影片的预算决定了拍摄进度会很紧张。The film's budget dictated a tough schedule.各种各样的挫折和问题耽搁了生产进度。Various set-backs and problems delayed production....
I started off as an ap-prentice and worked my way up.我从学徒开始干起，逐步上升。Some information for this report provided by AP and Reuters.本文部分信息来自AP和路透社.Operating SystemThe AP Golden Image software is shipped with all APs.操作系统APGol...