To truly experience the beauty of this decorative glass you should see it with light passing through it, especially sunlight, which is why stained glass is usually used for windows.
要真正体验这种装饰玻璃的美，你应该在有光通过它的时候看它，特别是在阳光通过的时候，这就是为什么彩色玻璃通常用于窗户上。
A usually adjustable opening in an optical instrument, such as a camera or a telescope, that limits the amount of light passing through a lens or onto a mirror.
光学仪器上的一个可调开口，如照相机或望远镜，它控制穿过镜头的或到镜面的光的数量。
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