invisible

Above him an invisible plane droned through the night sky.

在他头顶上空一架隐形飞机飞过夜空，不断发出低沉单调的声音。

"Cats use a causal-logical understanding of noise or sounds to predict the appearance of invisible objects," lead researcher Saho Takagi says in a press release.

首席研究员 Saho Takagi 在一份新闻稿中说：“猫利用对噪音或声音的因果逻辑的理解来预测看不见的物体的出现。”

The invisible group wasn't far behind the high-risk set, with more than 13% of them exhibiting depression.

看不见的那组在高风险组后面不远，其中超过13%的人表现出抑郁症状。

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。

It was strange, how invisible a clerk could feel.

很奇怪一名职员会感到如此地受人忽视。

Cheaters often feel invisible, as if their actions "don't count" and don't really hurt anyone.

作弊者常常觉得自己是不被注意到的，好像他们的行为“无关紧要”，不会真的伤害到任何人。

Because their behaviors are not usually seen as a red flag, these young people have been dubbed the "invisible risk" group by the study's authors.

因为他们的行为通常不被视为危险信号，这些年轻人被研究作者称为“隐形风险”群体。