If you describe something as invisible, you mean that it cannot be seen, for example because it is transparent, hidden, or very small.
The lines were so finely etched as to be invisible from a distance.
这些线条蚀刻得如此精细,离远点都看不出来。
You can use invisible when you are talking about something that cannot be seen but has a definite effect. In this sense, invisible is often used before a noun that refers to something visible.
All the time you are in doubt about the cause of your illness, you are fighting against an invisible enemy.
一直以来你都在怀疑自己的病因,你是在和一个无形的敌人斗争。
If you say that you feel invisible, you are complaining that you are being ignored by other people. If you say that a particular problem or situation is invisible, you are complaining that it is not being considered or dealt with.
It was strange, how invisible a clerk could feel.
很奇怪,一名职员竟会感到如此地受人忽视。
In stories, invisible people or things have a magic quality that makes people unable to see them.
The Invisible Man.
《隐身人》
In economics, invisible earnings are the money that a country makes as a result of services such as banking and tourism, rather than by producing goods.
The revenue from tourism is the biggest single item in the country's invisible earnings.
旅游收入是该国非贸易性收益中最大的单项收入。