protective hard case
保护性硬壳
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Fattening larvae become juicy colorful caterpillars then create a hard protective case around themselves as they enter the pupa stage.
正在养肥的幼虫变成有趣的毛虫，然后产生了一个坚固的保护壳裹在它们周围这样就进入了蛹的阶段。
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The hard protective case helps to prevent scratches and dings, and the ergonomic design provides optimal comfort and control.
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