int randomIdx = low + rand() % (high - low + 1);
更深层的转型，是工具化与服务化。平台不再仅仅因为撮合了一单交易而收费，而是围绕效率提升提供系统、工具与算法能力。当平台开始以管理系统、调度算法、数据分析等方式收费，其角色也随之从中介转向基础设施。
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She oversees the clinical research team at Aura, an online safety solution for individuals and families to protect their identities—and that of their children’s—in an increasingly digital landscape. The company uses AI to monitor families’ online activities and can even recognize keyboard inputs to denote if a child is using a harmful language or platform.
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