onprep.在 ... 之上；由 ... 支撑着；在（某一天）；关于；基于adv.穿着；向前（移动)；表示持续性adj.表示已连接、处于工作状态或使用中；发生；值班on loan出借的； 暂借的

1. She fluttered about the room anxiously.
   她坐立不安地在房间里走来走去。
2. Presently he began to fidget on his seat.
   接着他就坐立不安起来。
3. He was then sitting on thorns and waiting for you.
   他当时如坐针毡，焦急地等待着你。
4. The movie kept us on tenterhooks for two hours.
   这电影使我们如坐针毡了两个小时之久。