The big question is how all these devices will be connected and controlled.

关键的问题是如何连接并控制这些设备。

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Good quality controlled trials are needed to answer this question.

要回答这个问题，需要品质好的对照性的试验。

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Good quality controlled trials are needed to answer this question.

要回答这个问题，需要品质好的对照性的试验。

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