"杯弓蛇影"是一个成语,来源于中国古代的故事,其寓意是指由于过于敏感或惧怕而在没有真正危险的情况下感到恐惧或警惕。这个成语的故事大致是这样的:
相传古时有一个人,他在深山中行走时,突然看到地上有一条蛇。他因为害怕,连忙拿起手中的弓箭,准备射击这条蛇。但当他拉弓瞄准时,发现原来只是一根被风吹倒的树枝。他这时感到非常后悔,因为他几乎因为一根树枝而误杀了一条无辜的蛇。从此以后,他每次看到倒下的树枝或者其他看似危险的事物,都会产生误会以为是蛇,因而心生恐惧。
这个故事的寓意在于警示人们,不要因为一时的错觉或误解而产生过度的恐惧或担忧。人们应该理性地看待事物,避免被自己的想象或情绪左右,以免陷入不必要的恐慌和焦虑之中。

"Extremely suspicious " is an idiom, originate the story of Chinese ancient time, its implied meaning is to as a result of,point to too sensitive or be fear of and feel scared or vigilant below the circumstance that does not have real danger. This phrasal story is roughly such:
According to legend has a person in ancient times, he walks in remote mountains when, see suddenly there is a serpent on the ground. Because he fears, take the bow in the hand at once, preparation shoots this snake. But when he pulls bend to aim at, discovery is a branch that is blown by wind only so. He feels special at this moment regret, because of him almost because of a branch manslaughter an innocent snake. Evermore, he sees flat branch is other perhaps every time see the thing that seems danger, can producing misunderstanding think is a snake, consequently the heart gives birth to fear.
The implied meaning of this story depends on caution people, do not generate exceeding fear because of temporarily illusion or misunderstanding or be anxious. People should be rational thing of ground look upon, avoid to be controlled by oneself imagination or mood, lest be immersed in,needless panic is mixed in angst.