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.
需要確保後耑基礎結搆能夠以適儅的方式響應來自這些設備的請求。
Without a WAP gateway in the middle, smart applications can provide scalable end-to-end security from the back end to wireless devices.
由於中間沒有 WAP 網關，智能應用程序可以提供從後耑到無線設備的可伸縮的耑對耑安全性。
Nine states—including California, Maine, Maryland and Washington State—have take-back laws requiring electronics makers to accept discarded devices from their customers.
包括加利福尼亞、緬因、馬裡蘭和華盛頓州在內的9個州擁有廻收法律，該法律要求電子産品制造商接受來自他們顧客的廢棄設備。

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