在冷凝器接近标准圆锥接头处打四个穴孔.Make four indentations into the condenser near the standard cone joint.上述装置也称为圆锥摆.The present device is also called a conical pendulum.设有一组平行线与圆锥曲线相交.Consider a family of parallel lines that cut the co...
There was an impressive exchange of salutations.他们庄严地互相行礼.He receives these salutations with gravity , and buries them along with the rest of his knowledge.他郑重其事地接受他们的致意, 并把这些致意连同其他见闻统统珍藏在心里.Answer restaurant phone withi...