- protocol hierarchy
- 协议: agree on
- 的: 4次方是 The fourth power of 2 i ...
- 多层: multichamber; multilayer; mu ...
- 结构: structure; composition; cons ...
- 多层结构: layered construction; multi layer organization; multi layer structure; multilayered structure; multilayerorganization; multiple layer architecture; sandwich-like structure; stacked arrangement
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