ascend: implies progressive upward movement: the car ~ed the steep grade.


mount: suggests a getting up upon something raised: ~ a horse.  mountain高山 mount还指山峰 Mount Qomolangma珠穆朗玛峰.


climb: connotes the effort involved in the upward movement and is used when difficulty is implicit in the situation: ~ a tree to rescue a cat.


scale: suggests skill and adroitness in upward movement: ~ a high wall to freedom. （adroit机智，指能急中生智想办法达到目的skillful use of expedients to achieve one's purpose，如a adroit host of a radio call-in show一个机智的电台热线节目主持人。 expedient权宜之计）


ascend逐步上升: 指逐步、不间断地上升，mount登爬骑: 表示上到高处，climb费力登爬: 指动作费力困难，scale爬: 表示灵巧地爬。


记忆方法：1）首字母MACS马克思<==爬上顶峰  马克思实际是Karl Marx


         2）爬上的意思是到山顶mean to move upward or toward a summit.