A desire to create a better future for his children was his main motivation for starting the business.

motivation 是名词，来自动词 motivate（激励、激发）。motivate 由词根 mot（移动、运动）和后缀 -ate（使...）组成，字面意思是"使移动/行动"。 motivation 指"动机、动力"，即促使某人采取行动的内在原因或驱动力。在句中指"创业的内在驱动力"。