Notice the difference in the apparent distance of objects that each focal length produces.
注意每种焦距所产生的物体视距的差异。
A popular explanation is called the "apparent distance theory" : smaller objects, like trees and clouds, make the moon look larger.
一种广为接受的解释是“视距理论”，即树木和云彩等较小的物体使得月亮看起来更大。
As an appendix, expression for escape sign, size of Graph and letter, colour, brightness, brightness contrast, visibility and apparent distance are also listed from technical requirements.
作为附录，还列出了疏散标志的表示方法、图形文字尺寸、颜色、亮度、亮度比、可见度、视距等技术要求。
As an appendix, expression for escape sign, size of Graph and letter, colour, brightness, brightness contrast, visibility and apparent distance are also listed from technical requirements.
作为附录，还列出了疏散标志的表示方法、图形文字尺寸、颜色、亮度、亮度比、可见度、视距等技术要求。
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