自2010年至今的四级考试中， 共出现过 次
自2010年至今的六级考试中， 共出现过 次
ADJ-GRADED 看不见的;隐形的 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...
The belt is invisible even under the thinnest garments.
ADJ 无形的 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 which refers to something that can usually be seen.
Parents fear they might overstep these invisible boundaries...
Her father's face had suddenly tightened as though he was being strangled by invisible hands.
ADJ-GRADED 被人忽视的;不为人注意的 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...
The problems of the poor are largely invisible.
ADJ (故事中的人或事物)隐身的，隐形的 In stories, invisible people or things have a magic quality which makes people unable to see them.
...The Invisible Man.
ADJ (收入)非贸易的,无形的 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.
Tourism is Britain's single biggest invisible export...
The revenue from tourism is the biggest single item in the country's invisible earnings...
N-PLURAL 无形服务业(如银行业、旅游业) Invisibles are services such as banking and tourism, which provide a country's invisible earnings.