持续的失业威胁使数千名大学研究人员感到忧虑。

A constant threat of unemployment hangs over thousands of university researchers.

《柯林斯英汉双解大词典》

科学家忧虑海冰的持续消融将会导致新的融解，因为(与冰层相比)颜色暗淡的海面会吸收更多的热量，使海水加温。

Scientists are concerned that the loss of sea ice is leading to a feedback effect where the newly exposed, darker ocean absorbs more sunlight, warming the water yet further.

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由于“人口”这个词会导致对于国家控制以及生育自由限制方面的忧虑，将可持续性加到人口增长的概念上并不为人所乐见。

It's unpopular to apply sustainability to the concept of population growth, as the word "population" evokes worries about state control and limits on reproductive freedom.

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Her statement points to a persistent worry, and it's a worry that exists even now in the twentieth century about the nature of Milton's power.

她的陈述不断透露着忧虑，这种忧虑一直持续到现在20世纪,关于弥尔顿之力量的本性的忧虑。

耶鲁公开课 - 弥尔顿课程节选