上茧：茧形、色泽、茧层厚薄及缩皱正常，无疵点的茧。
他把煤块塞进钟形装置的中心，并全部放在表壳上，然后紧紧地裹成一个茧状。
He tucked the coal into the center of the clockwork, and placed it all on the skin, and wrapped it up and tight it into a cocoon shape.
“我们生活在被网络茧壳包裹的地球上，”贝克匀说。
"We live in a cyber cocoon enveloping the Earth," Baker said.
在茧上，细菌通过产生一种至少9种不同抗生物质的组合剂，来抵抗很广泛的系列潜在有害真菌和细菌。
On the cocoon, the bacteria provide protection against a wide range of potentially detrimental fungi and bacteria by producing a cocktail of at least nine different antibiotic substances.
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