As explained in Access patterns for service Creation scenario, the main difference between indirect and direct exposure is the inclusion of a service component layer.

正如服务创建场景的访问模式中所述，间接公开和直接公开的区别在于其中包含了服务组件层。

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This is the lowest component layer of the Internet protocols, as TCP/IP is designed to be hardware independent.

它在网络协议中是最低级的层次成分，而TCP/IP协议是与硬件无关的。

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In other words it a vertical add-on, or a horizontal core component layer?

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Methane is the principal component of natural gas, and massive amounts of it are trapped in reservoirs beneath the sea floor and under a layer of the ice-like substance.

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