我们选择把主体放置在右上交叉点，这样我们可以看到海鸥的整个阴影和指向海鸥的大部分足迹。
We picked the upper-right position for this subject so that we could see the full shadow and most of the tracks that lead to the seagull.
反应在二重态和四重态势能面上存在四个交叉点，整个反应在二重态势能面和四重态势能面上交替进行。
There exist four cross points in this process on the PES of four and twain states. The reaction conducts in twain and four situation potential energy surfaces alternately.
反应在二重态和四重态势能面上存在四个交叉点，整个反应在二重态势能面和四重态势能面上交替进行。
There exist four cross points in this process on the PES of four and twain states. The reaction conducts in twain and four situation potential energy surfaces alternately.
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