An external layer, such as bark or rind.
外层外层，如树皮或果皮。
An external layer of compact Bone surrounds a central area of spongy Bone, except at the marrow cavity.
骨的外层为质密的骨皮质，包围着海绵状骨松质中心区（不算骨髓腔）。
The consumer layer contains the applications used by end users within an organization, or the inbound interfaces to external organizations (such as customers or partners).
使用者层包含组织内最终用户使用的应用程序，或外部组织（如客户或合作伙伴）的入站接口。
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