来自《耶鲁大学开放课程：新生有机化学 第3集 第3集》
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They constrained it.他们做了一些限制 -
They didn't allow everything to vary.他们没有让所有变量都变化 -
They said we're going to require the two distances to be the same.他们让两个距离保持相同 -
So now instead of three variables,所以现在不是三个变量 -
you have only two,而是只有两个 -
and you can plot those two on a two-dimensional paper;这样你就可以将它们画在二维的纸上 -
you can plot two things.你可以画出两个变量 -
So here we're going to plot the position.现在我们就要画出它的位置 -
If the two distances are equal,如果这两个距离相等 -
if you know the position of the top right那么当你清楚右上角的位置 -
you know the position of the top left,也就可以知道左上角的位置 -
because the original oxygen is at the origin 0,0.因为原来的氧位于原点