He followed in his father's footsteps and became a teacher.

footsteps 是名词 footstep 的复数形式，由 foot（脚）和 step（步伐）组成，字面意思是"脚印、足迹"。 follow in someone's footsteps 是一个固定短语，意思是"追随某人的脚步"，比喻效仿某人的人生道路或职业选择。