His motivation for learning English is to travel abroad.

motivation 是名词，来自动词 motivate（激励、促使）。motivate 由词根 mot（移动、行动）和后缀 -ivate（使...）组成，字面意思是"使行动起来"。 motivation 指"动力、动机"，即推动人做某事的内心驱动力或原因。