The rain had stopped during the forenoon and three times we had heard planes coming, seen them pass overhead, watched them go far to the left and heard them bombing on the main highroad...."

VOA: special.2011.06.26

You can start from one nucleus and go to the next nucleus, and there are no zero planes, no nodes, nothing.

你可以从一个核出发,看向另一个核，中间没有零平面，没有节点，什么也没有。

麻省理工公开课 - 固态化学导论课程节选