2. He was grabbed from behind and propelled through the door. 有人从后面抓住他，把他推过门去。
3. Medical spending, which typically rises faster than wages and the overall economy, is propelled by two things. 医疗支出的增长通常快于工资和整体经济的增长，其背后有两个推动因素。
4. The blast propelled a tangerine-sized slug of copper down into the target, destroying it with the impact and the accompanying shrapnel. 爆炸将一枚橘子大小的铜弹射向目标，利用撞击力和弹片摧毁目标。
5. Steamboats were not only faster but also transported upriver freight for about one-tenth of what it had previously cost on hand-propelled keelboats. 蒸汽船不仅速度更快，往上游运送货物的成本也只有以前手推运货船的十分之一。
