Close inspection of the surface of Prometheus itself in the above image shows interesting structure and craters.

上图中，对土卫十六本身表面的近距离观察展现了其有趣的结构和坑洞。

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If the cholera toxin is present, the toxin binds to the dextran because its chemical structure is similar to the cholera toxin receptor (GM1) found on the surface of cells in a victim's gut.

如果水样中有霍乱毒素，霍乱毒素将会附着在葡萄聚糖上，因为葡萄聚糖的化学结构与死于霍乱的死者肠道细胞表面上发现的霍乱毒素受体(神经节苷脂gm1)很相似。

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Surface reconstruction helps scientists more closely align comparable regions and structures in many different brains and has been used to create online atlases of brain structure.

“表面重建”技术帮助科学家更为精密地对许多不同大脑的类似区域与结构进行校准，同时该技术还被用于在线地创建大脑结构地图集。

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But in this test, each identical fake flower, regardless of its surface structure, contained a sweet reward of sucrose.

BBC: Velcro petals help bees hang on

Even websites and blogs have been devoted to only this topic of tax structures, and seeing how I must intelligently submit this in so many words or less, I can only begin to scratch the surface of how the structure itself will be reformatted.

FORBES: Guest Post: Tax Reform

Digging below the surface of GDP reveals a structure of value-adding production far more complex than the simplistic analysis given by most media reports.

FORBES: Think Consumption Is The 'Engine' Of Our Economy? Think Again.