今天我們要學的詞是mandatory. Mandatory is spelled m-a-n-d-a-t-o-r-y, mandatory. Mandatory指“強制性的，必須的”。比如，mandatory retirement age 強制退休年齡。

Bulgaria's Minister of Regional Development is calling for the introduction of mandatory insurance for private residencies and all privately-owned buildings. 保加利亞地區發展部部長提出，應要求該國的私人住宅和全部私有建筑一律購買保險。The New York City Council is considering a new bill that will make it mandatory for all bikers to wear helmets.紐約市市議員正在考慮一項新議案，硬性要求紐約市每個騎自行車的人都必須佩戴頭盔。好，今天我們學習的詞是mandatory, mandatory, mandatory.....