In other words, the percentages indicate the ration between the read value with an “open air” space in front, and the pull-up voltage for the photocell.
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In North America, people who are facing each other generally want about three feet of space in front of them.
在北美,人们面对面交谈时要保留三英尺左右的距离。
Here's another action shot where it's important to leave more space in front of a moving subject than behind it.
这是另一张动态照片。运动主体的前面比后面留有更多空间是很重要的。
Shrink it so it becomes a tiny little picture in the open space in front of you. Don't let it stand there quietly!
将它缩小使它成为你面前的一张小图片。不要让它静静地呆在那里!
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