基本信息
43. make an attempt at doing sth. (to do sth.) 试图做……
Before they fled the country, the enemy vainly made at attempted at destroying all the factories. 敌人在逃往国外前，妄图把所有工厂都毁掉。
45. on the average (=on average, on an average) 平均
On the average, there are 300 tourists a week. 每星期平均有300游客。
