The deepest layer, called the renal capsule, is a smooth transparent sheet of dense connective tissue that gives the kidney its distinctive shape.

最内层为肾包膜（纤维囊），是一层光滑透明的致密结缔组织，赋予肾独特的形状。

They are covered by the renal capsule, which is a tough capsule of fibrous connective tissue.

它们被肾包膜所覆盖，肾包膜是一种由纤维结缔组织构成的坚硬的包膜。