Vague unknown fears, for which there can be given no explanation, no reason.
Yet the patient may be terrified of something terrible going to happen, he knows not what.
These vague unexplainable fears may haunt by night or day.
Sufferers often are afraid to tell their trouble to othera.
莫名难以言状的恐惧，没法解释也没有理由。
但病人总是害怕恐怖的事情将会发生，却又不知道是什么，这种模糊又无法解释的恐惧可能会日夜缠绕人心，他们通常害怕将困扰告诉别人。