It's a simple term that encapsulates the fact that relationships at work can reasonably be non-intimate, inconsequential, unimportant and even, dare I say it, disposable or substitutable.

这是一个简单的术语，概括了以下事实：工作中的关系可以合理地是非亲密的，无关紧要的，不重要的，甚至可以说是可抛弃的或可替代的。

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Subtype must be substitutable for their base types.

子类型必须能够替代他们的基本类型。

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Derived types must be completely substitutable for their base types.

派生类型必须是它们的基础类型完全可替换的。

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The idea that natural assets are substitutable makes some environmentalists (including some contributors to the report) nervous.

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At the extremes to an economist everything is substitutable.

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The FDA has yet to pass judgement on the subject of substitutable or interchangeable biosimilars, but consensus indicates that such a status could be conferred on a biosimilar if it is supported with more extensive clinical testing.

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