什么是ZK？

<ul> <li><a href="https://mp.weixin.qq.com/s/i2_c4A0146B7Ev8QnofbfQ">https://mp.weixin.qq.com/s/i2_c4A0146B7Ev8QnofbfQ</a></li> <li><a href="https://mp.weixin.qq.com/s/J8erMBhiogXoQcn91SJcbw">https://mp.weixin.qq.com/s/J8erMBhiogXoQcn91SJcbw</a></li> </ul>