1. He is optimistic that once parents make a commitment to the program, they will be daily role models for their children, unlike parents whose children are in boarding schools.
    他很乐观地相信，一旦家长们投入到计划当中，他们就会成为孩子们日常行为的榜样，这一点与寄宿学校的学生家长完全不同。

2. Passengers checked their baggage before boarding the plane.
    旅客上飞机前托运了行李。