【句型1】Modern alpinists try to climb mountains by a route which will give them good sport, and the more difficult it is, the more highly it is regarded.（Lesson 3）
【译文】现代登山运动员力图沿着一条能从中得到锻炼乐趣的路线登山。他们认为路线愈艰难则愈为人们重视。
【讲解】the more…, the more…这种句型叫比例句。《流利英语》中另有三句可一并学习。
【例1】The further off this solid obstruction, the longer time will elapse for the return of the echo. （Lesson 7）
【译文】离固体障碍物越远，回声返回所用时间就越长。
【讲解】obstruction后省略了is。
【例2】We are so familiar with the fact that man ages, that people have for years assumed that the process of losing vigour with time, of becoming more likely to die the older we get, was something self-evident, like the cooling of a hot kettle or the wearing-out of a pair of shoes. （Lesson 37）
【译文】我们都熟悉这样的事实：人总是要衰老的；人们多年来一直认为，生命随着时间流逝而衰退或人越老越可能死掉这一过程不言而喻，恰似一壶热水会冷却、一双鞋会被穿破一样。
【讲解】becoming more likely to die the older we get是变形的比例句，等于the older we get, the more likely we will die。
【例3】The stronger the will, the more futile the task. （Lesson 46）
【译文】这种意志越强烈，这种尝试越徒劳。
【讲解】will后省略了is，task后省略了will be。