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We are usually tired already by the time we get on a plane, and the crowded space and unstable internet connection make work more challenging.

当我们上飞机的时候，通常已经很累了，而拥挤的空间和不稳定的网络使工作更具挑战性。

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UNICEF reports the global financial crisis and unstable food prices are increasing poverty and malnutrition.

VOA: standard.2010.02.04

Six-month-olds don't, and even 12-month-olds don't find anything weird about this, while adults are sophisticated enough to understand that that's an unstable configuration and should fall over.

六个月大的婴儿则不会这么想,即使是十二个月大的婴儿,也没有发现这个木块存在的异常,只有经历世事的成年人才会理解,这不是个稳定的结构,而这个结构是会倒塌的

耶鲁公开课 - 心理学导论课程节选

and they think that jobs like movie directors are unstable.

但却认为电影导演这样的职业很不稳定。

在梦想与现实之间 - SpeakingMax英语口语达人

During his life, Nobel was most famous for his experimentations with nitroglycerine, a highly explosive and unstable liquid.

BBC: Sweden��s Nobel gift to the world

But countless dangers lurk: poisonous gases, flooded tunnels, explosive vapors and unstable walls and roofs.

ENGADGET: Gemini-Scout robot can scope out mining accidents, may save lives (video)

Yulia Mostovaya, editor of Zerkalo Nedeli, a political weekly, says this coalition is weak and unstable.

ECONOMIST: As Ukraine��s politicians bicker, the economy slides