例句：
It was incumbent on them to attend.
他們必須出席。
Our children attend the same school.
我們的孩子上同一所學(xué)校。
There are plans to extend the no-smoking area.
現(xiàn)已有擴大無煙區(qū)的計劃。
The meat is chemically treated to extend shelf life.
豬肉經(jīng)過化學(xué)處理以延長保存期。
Careful maintenance can extend the life of your car.
精心保養(yǎng)可延長汽車壽命。