4.compel vt. 强迫,迫使 com-加强意义; pel=push 推动
Duty compelled these soldiers to volunteer for the mission.
force>compel>oblige通过法律、社会、道义的手法强迫
propel 推动,驱动
expel 驱逐 ex-out
repel逐回
dispel消除
compelling a. 强制性的,urgently requiring attention