And you can see this expanding rings of activity of stimulating, Cause a pattern of activities that move forward from the back of the brain to the front of the brain, in a very regular pattern which we call a visual field map.

眼睛在前面，指向这个红点，大家看到，刺激活动不断扩大的环路,引起一个活动的模式，从大脑的后不向前部移动，这一模式十分规律，我们可以称其为视觉分布图。

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And these rings are indicative of the crystal structure of nickel and can be explained only by invoking wavelike properties of light.

这些光圈,表明了了镍的晶体结构,而且只能通过,光线中波的特征来解释。

麻省理工公开课 - 固态化学导论课程节选

It wouldn't be the same if I turned it upside down because the carbons - the rings here, the pentose's would all be turned over, the chemistry would look different and the sequence of bases would look different.

记住单链倒过来,就和原来不一样了,这是因为碳原子和糖环结构,戊糖会翻转,使得这个化学结构看起来不一样了,碱基的顺序也不一样了

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And the result is a diffraction pattern that produces a series of rings.

得到的衍射图案是,一系列光圈。

麻省理工公开课 - 固态化学导论课程节选