在低覆盖度下，单个乙烯分子占据了短桥位和顶位之间的中间位置。
At low coverage the ethylene molecule occupies approximately the midway between the short bridge and atop sites.
计算结果表明氢在石墨(0001)表面的顶位和桥位可以形成较强的化学吸附。
Calculation results indicate that top and bridge sites on Graphite (0001) are more stable chemisorption.
我得到了一位顶级摄影师的服务。
I have obtained the services of a top photographer to take our pictures.
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