这是在设计飞机中的棘手难题。

This is the catch in designing planes .

youdao

未来十年，如何改变这一萧条的轨迹[注1]将是政策制定者们要面对的最棘手难题。

How to alter this bleak trajectory will be policymakers' most difficult task over the next decade.

youdao

另一个棘手难题是如何取缔伊朗和海湾地区出口中转中心——迪拜之间的地下商贸往来。

And how to close off prohibited commercial traffic between Iran and Dubai, a major re-export hub in the Gulf, is another unanswered challenge.

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