I think this is taken about two years after they discovered the fourth quantum number.
这张照片拍摄于他们发现,第四个量子数的两年后。
麻省理工公开课 - 化学原理课程节选
You count n leaves--you count the number of leaves.
你数了n片叶子...不对
耶鲁公开课 - 金融市场课程节选
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