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 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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The characteristics, protective principle and application of Sterically hindered silane blocking agents were reviewed.

综述了位阻型硅烷化试剂的特点、保护原理和应用。

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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