48. be apt to do: 有……倾向的，易于……的；往往，常常 look down on: 蔑视，轻视 Some people are apt to think of their own way of life as the normal one and to look down on life-styles that differ from it. 有些人倾向于认为自己的生活方式才是正常的，因而瞧不起与此不同的生活方式。
49. give off: 释放（气味、热量、气体）=give out send out: 发出信号、声音、光等 I love the smell the pages of an old book give off when you open it. 我喜欢翻开一本旧书时，书籍所散发出的那种气味。
50. collide with: 碰撞；目标或意见相冲突 Her car collided with a bus from behind. 她的车和后方的一辆公交撞到了一起。 conflict: 指信仰、观念或利益之间的严重分歧 clash with: 指信仰、观点等相互抵触，不相容
51. wear away: 指某物磨损，逐渐磨薄，最终消失 wear out: 也指磨损，特指用坏 Dripping water wears away a stone not with its strength, but with its constancy. 滴水穿石靠的不是强度，而是持久。
