extant remains of the ancient wall尚存的古城墙遗迹Two fourteenth-century manuscripts of this text are still extant...这个文本仍有两份14世纪手抄本存世。It contains the earliest documents extant on the life, teaching, crucifixion, and resurrectio...
物理学研究力学、热学 、 光学 、 声学和电学.Physics studies mechanics , heat, light, sound and electricity.这两个学生都做了不少电学实验.Both students have made quite a few experiments on electricity.从量子电动力学可以得出所有已知的电学 、 力学和化学定律.Out of quantum electrodyna...