与光子或声波的物理实体不同，感知是大脑的产物。
More than the physical reality of photons or sound waves, perception is a product of the brain.
这些服务数据是如何被发现的、怎样得到规范化的，以及怎样与永久性的实体或者物理性数据源相联系的，已经超出了本文的讨论范围。
How service data is discovered and normalized and how it relates to persistent entities or physical data sources is beyond the scope of this article.
数字图书馆与传统图书馆相比，具有独特的特征：即物理空间实体不再是特定标志。
Comparing with the traditional library, the digital library has its particular feature: the solid physical space is no longer a special sign.
它是一种“内容实体”。例如读英文版的“低温物理学”、“神经生理学”，文字与语言所占的角色是很次要的。
It forms the content itself, like English edition of "Low-Temperature Physics" or "Nerve Physiology." In this case, the role of language and style is only secondary.
它是一种“内容实体”。例如读英文版的“低温物理学”、“神经生理学”，文字与语言所占的角色是很次要的。
It forms the content itself, like English edition of "Low-Temperature Physics" or "Nerve Physiology." In this case, the role of language and style is only secondary.
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