But some pledges may be impossible to deliver.

但是，一些承诺也许不可能得以实现。

youdao

Note: it may be impossible to measure the "true" standard deviation.

注意：不可能测量出“真实的”标准偏差。

youdao

Consensus may be impossible, given the breadth and complexity of this spill.

考虑到石油泄漏的广度和气复杂度，大家达成共识也许是不可能的。

youdao

Oftentimes, inventions that seem, in the abstract, to be good ideas may be impossible because something that you have to do to make it actually come into practice is too expensive and so it's not economic to produce the invention.

通常在理论上,创新固然不错,但却很难实现,因为把创意变成现实,花费会相当的昂贵,实现这样的创意非常不合算

耶鲁公开课 - 金融市场课程节选

Still, keeping Committed Expenses to 60% of your gross income may be impossible, at least initially.

NPR: Untangle Your Finances Before Tying the Knot

Because it's so hard to trace the attack to a perpetrator, direct retaliation may be impossible.

NPR: Cyberattack: U.S. Unready For Future Face Of War

Security officials say that events such as the Brussels robbery may be impossible to completely prevent.

WSJ: Gunmen Waylay Jet, Swipe Diamond Trove