Jack fagged away at his math.杰克专心费力做数学.Ecole nationale sup é rieure d'informatique et de math é matiques appliqu é es de Grenoble.格勒诺布尔国立高等电工工程师学校.Then one morning we were working math problems at the chalkboard.后来有...
a hoary old joke老掉牙的笑话They discussed the hoary old problem.他们讨论老问题.Without a word spoken, he hurried away, with his hoary head bending low.他什么也没说, 低着白发苍苍的头, 匆匆地走了....
他表演了一套惊人的杂技功夫。He performed a sensational acrobatic feat.走钢丝杂技acrobatics on the high wire我总是着迷于马戏团里的杂技演员.I was always fascinated by the acrobats at the circus....