|==??at the same time, people continue to treat fire as an event that needs to be wholly controlled and 
unleashed only out of necessity. 与此同时，人们继续把用火视为一种需要全面控制的事件，只有在必要之时才放出来使用。
本句的主干是people continue to treat fire as an event。that在此处引导定语从句，修饰先行词event。
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