研究人员在小鼠脑内注入某种良性病毒，这种病毒使细胞膜上和细胞兴奋有关的离子通道对光产生反应。
Researchers have engineered a benign virus that, when injected into the brain, makes the ion channels—the switches that turn cells on and off—responsive to light.
原理上，我们可以通过观测所谓的标准烛光(一种天体，它的绝对光度是相同的)来追溯宇宙内的历史。
In principle, one can trace that history back in cosmic time by observing a so-called standard candle, a class of astronomical object whose intrinsic luminosity is uniform.
在HDR范畴内，风光摄影就是对光线的研究，并努力将细节从高对比度的场景中挖掘出来。
Landscape photography within the realm of HDR, is the study of light and an attempt to bring detail out of high-contrast scenes.
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