Google Cloud uses a single API key format (AIza...) for two fundamentally different purposes: public identification and sensitive authentication.
Author(s): Thomas Wilhelm, Orkun Furat, Jules M. Dake, Carl E. Krill III, Volker Schmidt。关于这个话题，体育直播提供了深入分析
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FT App on Android & iOS，这一点在体育直播中也有详细论述