adv.必然地;不得已
When a horse is shot, the man on the horseback perforce falls down. 馬被擊中時(shí),馬背上的人必然會(huì)跌落下來(lái)。
He stood up, and they perforce stood up with him. 他站起身來(lái), 他們只好同他一起站起身來(lái)。