adv.以前,从前
adj.以前的,从前的
He wrote this whilst invigilating a biology examination.
这是他在生物考试考场监考时写的.
Whilst playing badminton, I ruptured my Achilles tendon.
打羽毛球时,我的跟腱撕裂了。
He was at his happiest whilst playing cricket.
玩板球时他最开心了。