随着我们的下潜往跑道上，你可以看到的方法进行，但是跑道灯光本身并没有可见的。
As we descend toward the runway, you can see the approach lights ahead, but the runway itself isn't yet visible.
它通常在夜晚或者黑暗的房间里制作。 在许多情况下，灯光源本身不一定在图像里。
In many cases the light source itself does not have to appear in the image.
只有当这些壁画沐浴在紫外灯光下时，这些细节之处才得以可见，但将这些传世珍品一直置于紫外灯的狂轰乱炸之下不仅不现实，对壁画本身也有害。
They are only visible when they are bathed in ultra-violet light and subjecting them to such constant bombardment would be not only impractical but harmful.
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