be upon thorns的用法和樣例：
例句
- Not knowing when he would be crowned, the man was in daily suspense, unable to sit down or sleep at ease.
那劣紳不知何日要戴高帽子，每日在家放心不下，坐卧不寧。 - He was then sitting on thorns and waiting for you.
他當時如坐針氈，焦急地等待著你。 - It had been intolerable to be with him since then.
從此跟他在一起就如坐針氈。 - It is unbearable to be always on thorns.
老是處於焦慮不安的情況中是受不了的。 - The gap left by the disquieting dimension of history has, naturally, to be filled.
在歷史領域中造成的焦慮不安自然地被填補了。
