The key development lies in the ability of the sphere, an optical device, not only to remain invisible itself but to slow light.
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。
These object are so dense that nothing, not even light, escapes once inside a sphere of influence known as an event horizon.
这些东西的密度是那样大，以至于在它们的势力范围——也就是黑洞表面——之内，任何东西，甚至光线，都不能逃离。
Leonardo was obsessed with problems like how to create translucent effects in painting, how to capture the mysteries of light - the very problems posed by painting a glass sphere.
达·芬奇沉迷于像如何在画中营造半透明效果、如何展现光的奥秘——这正是画一个玻璃球要面对的问题。
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