原因如下：1830年，一位名叫乔治·兰金（George Rankin）的当地官员用一根绳子把自己吊入洞穴，这根绳子固定在洞穴壁的一个突出石块上。

Here's why: In 1830 a local official named George Rankin lowered himself into the cave on a rope tied to a protrusion in the cave wall.

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这种生物膜一接触到金，就会使之溶解，产生的有毒金离子又会破坏这种细菌的细胞壁。

The biofilm dissolves the gold on contact, creating toxic gold ions that can break down the bacteria's cell walls.

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成熟叶片小叶脉的韧皮细胞发现有大量的金颗粒标记，金颗粒主要标记在传递细胞的细胞壁中。

Many gold particles were distributed over the phloem cells of the fine veins of the mature leaves, and were mainly located in the cell wall of the transfer cells.

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