one part of sth larger 一部分◆He invested a substantial portion of his savings in the business. 他将一大部分储蓄投资於这家企业。◆The division accounts for only a small portion of total sales. 这个部门的销售额只占总销售额的一小部分。
an amount of food that is large enough for one person （食物的）一份◆The restaurant serves generous portions. 这家餐馆的饭菜份量很大。◆They were specialists in individual portion control for the food-service industry. 他们是饮食服务行业中个人份量控制方面的专家。