Principle 4: robust - Content must be robust enough that it can be interpreted reliably by a wide variety of user agents, including assistive technologies.

原则4：健壮性——内容必须足够健壮，从而能够通过包括辅助技术在内的各种用户代理可靠的进行解释。

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In the interview, however I have found that most consumers paint paint paint agent agent effect is not understood, it is unclear which of the paint coating agents joined principle.

然而笔者在采访中也发现，大部分消费者对油漆涂料代理加盟油漆的油漆涂料代理加盟效果并不了解，也不清楚其中的油漆涂料代理加盟原理。

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In order to produce dry sanding paper applied to soft materials, the slurry coating was prepared by smearing unblocked materials according to the phase change principle of endothermal agents.

为研制适用于软质材料磨削的干磨砂纸，通过涂覆特殊的防堵塞材料，利用吸热剂的相转变原理，研制了干磨砂纸超涂层浆料。

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"As a former protectee of Secret Service agents, I see no problem with the principle that they -- like all federal agents -- can be called upon to aid federal criminal investigations, " Quayle said.

CNN: Quayle: Secret Service Should Testify

In his quote, Milton Friedman alludes to the traditional notions of fiduciary duties of corporate officers and other agents like financial advisors that require a strict duty of loyalty to the interests of the principle (the shareholders).

FORBES: Friend or Foe? Fiduciary Duties Meet Socially Responsible Investments