第一次发文，恳请大家协助解答~ 以下是BBC某篇新闻的节录，想知道的是"in which..." 这边的in是跟哪个字相关呢？ Crownstone is promoting a system in which a home's lights and plug sockets automatically react to a resident's presence based on them having a Bluetooth-broadcasting wearable or smartphone on them, rather than waiting to be given a command. 感谢~ --

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