Some people use this trick to make a goal harder, or even impossible, to reach.

一些人会利用这种窍门让目标变得更加难以实现，甚至无法实现。

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This may be very difficult (or even impossible) to accomplish while maintaining links to your code's history.

这在维护代码历史记录的链接时是很难(或甚至不可能)完成。

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Except for cancer, samples of diseased tissue are difficult or even impossible to take from living patients.

除了癌症以外，许多病变组织的样本很难或是根本不可能从存活着的患者那里获得。

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Many of you reading this will have a story about a difficult (or even impossible) boss.

FORBES: Does the Difficult Boss Always Deserve to Be Fired?

If you're worried about climate change but don't like carbon taxes, think about the messy or even impossible alternatives!

FORBES: Magazine Article

Both these features make writing and enforcing contracts which take every possible eventuality into consideration difficult, or even impossible.

ECONOMIST: Economics focus