back-to-back devices

基本解释

You need to ensure that your back-end infrastructure can respond to requests from these devices in a useful fashion.
需要确保后端基础结构能够以适当的方式响应来自这些设备的请求。
Without a WAP gateway in the middle, smart applications can provide scalable end-to-end security from the back end to wireless devices.
由于中间没有 WAP 网关，智能应用程序可以提供从后端到无线设备的可伸缩的端对端安全性。
Nine states—including California, Maine, Maryland and Washington State—have take-back laws requiring electronics makers to accept discarded devices from their customers.
包括加利福尼亚、缅因、马里兰和华盛顿州在内的9个州拥有回收法律，该法律要求电子产品制造商接受来自他们顾客的废弃设备。

But most back surgeries--and back surgery devices--exist to ease pain, not save lives.
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