英语习语：

up in the air 尚未决定的；捉摸不定的；悬而未决的

双语例句：
Her plans for the weekend are still up in the air.
她尚未决定如何度过这个周末。)
But at face value, the question may not be so easy for the SEC to answer, leaving the federal judge's approval of the settlement up in the air.
有鉴于此，法官提出的问题合情合理。可是，表面上看来，SEC要回答这个问题并不容易，因此联邦法官是否会批准和解方案也就悬而未决。
While the return on investment on an MBA is still up in the air, no one is disputing that what you learn in business school will be extremely valuable as the economy recovers.
尽管MBA课程的投资回报率仍然悬而未决，但毋庸置疑的是当经济复苏的时候，商学院所学的东西将是极其宝贵的。
May 25, 2010 — As Carbon Expo 2010 opens this week in Cologne, Germany, carbon traders face an uncertain future and lower prices, with a new global climate change agreement still up in the air.
2010年5月25日 --随着 2010年碳博览会本周在德国科隆开幕，而且新的全球气候变化协议仍悬而未决，碳交易商们将面临不确定的未来和较低的碳价。
How this will affect battery life is up in the air, but Motorola has always been very careful about maintaining good battery life.
但这对电池寿命的影响仍悬而未决，但是摩托罗拉始终在保持电池寿命这方面非常谨慎。
Meanwhile, control of Telemedia remains up in the air.
同时，电讯传媒的控制权仍然悬而未决。