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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In some work environments this may seem impractical, or even impossible, but the principle can be applied to any situation.

在一些工作环境中，这可能不太实际，或甚至不可能实施，但它的原理可能适用于任何情况。

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Bad sectors slow down hard disk performance and sometimes make data writing (such as file saving) difficult, or even impossible.

坏扇区降低硬盘性能，有时甚至使数据写入(如文件保存)困难，甚至是不能。

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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