Large selection and offers some free images if you complete a free registration.
量很大，如果注册了你还会得到免费的图片。
Registration Service to coordinate protocol selection and register participants.
注册服务（Registration Service），用来协调协议选择（protocol selection）和注册参与方。
Simulation results showed that ATLMM not only provided adaptive protocol selection for mobile nodes, but also decreased the overall inter-domain registration cost.
仿真结果表明，ATLMM不仅为移动节点提供了自适应的协议选择，而且降低了总体的域外注册开销。
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