verb · to set a maximum limit or ceiling on amounts like spending, prizes, or interest rates

该流量套餐每月费用五十元封顶。

verb · to reach the highest point of growth, profit, or potential

当利润增长封顶后，企业必须寻找新的业务领域。

verb · to cease growth at the tip of a plant bud or branch

棉花在生长期需要适时封顶，以提高产量。

verb · to complete the roof of a building during construction

这座摩天大楼今天正式封顶了。