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purchase v. 买
（比buy正式，主要用于书面语， 还可是n.）
-Can you purchase freedom with money?
-yesterday I bought a tie, that look terrible.
purchase money 买进价格/进货价格
purchasing power
shiver v. 颤抖=
tremble
区别:
整体的颤抖用shiver，部分用tremble
-He is shivering with cold.
-His hands are trembling.
-Her trembling voice betrayed his secret.
haul v.拖曳
（pull with effort or force）强调用力
-They hauled the boat up the beach.
haul sb. to a volleyball match
强拉某人去看排球比赛
【辨】：
1）pull 应用范围最广，连续不断的拉
2）drag 拖拉，强调二者有摩擦力
-The stone was so heavy that I had to drag it into the room
drag oneself to 拖着疲惫的身躯去
-After a day’s hard work, I dragged myself home.
3）tug飞快的拖拉，强调幅度大，动作快
-Look，a thief tug the bicycle.
4）tow 借助外力拖拉较大较重的物体
-The towed the huge stone with a truck/ lorry.
