求翻译：Experimentation infrastructures relying on the embedded sensing technology have dramatically progressed hand-in-hand with their growth as well. Many sensing testbeds of which Kansei, Motelab, Orbit, NetEye [4], and PeopleNet are but a few, have been built in such a way that sensing applications can be readily accommodated by the embedded network. These edge networked testbeds feature users need, facilitate their experiments, but are logically isolated from each other due to the fact that substrates are owned by different administrative domains and remote invokable interfaces are incompatible. It's impossible to enable concurrent experiments across testbeds. From research perspective, to learn about variability of network performance in different backgrounds, and size scales, experiments requires testbeds to provide long-lived and repeated sensing service across heterogeneous substrates. This motivates the emergent requirement that testbeds need to be federated. Federation provides a convenient, uniform way of discovering and tasking desired sensing resources. Kansei based system, as a GENI-compatible architecture, focuses on the experiment control and federated resource management. GENI aggregates that are instances of the architecture consist of the heterogeneous testbed [4].是什么意思？

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