He also used ski poles in an unorthodox way to propel himself as he skied. 用滑雪杆使自己前进
Medical spending, which typically rises faster than wages and the overall economy, is propelled by two things: the high prices charged for medical services in this country and the volume of unnecessary care delivered by doctors and hospitals, which often perform a lot more tests and treatments than a patient really needs. 其推动因素有两点
But all these concepts are massively expensive, require safety certification standards for road and air, need 30 controls, involve complex folding wings and propellers, and have to be flown from air-strips.
One of our students was unable to propel her wheelchair up the ramp. 我们有名学生无法把她的轮椅推上坡道。
The film propelled her to stardom. 那部电影让她成了明星。