关键在于光纤球功能的开发，一种光学设备，不仅要保持自身的不可见性，还要能减缓光线。
The key development lies in the ability of the sphere, an optical device, not only to remain invisible itself but to slow light.
元数据指定用户动作的范围和可见性。
Metadata specify the scope for the user actions and visibility.
我们会在下面的“可见性规则”章节讨论不同的可见性规则和控制它们的关键字。
We'll discuss the various visibility rules and the keywords that control them in the section called "visibility rules" below.
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