标签： 4H

https://en.wikipedia.org/wiki/4-H
https://www.teepr.com/864394/tinayi/%E9%87%8E%E5%A4%96%E6%B1%82%E7%94%9F%E6%8A%80%E5%B7%A7/
https://zhuanlan.zhihu.com/p/20669529
https://baike.baidu.com/item/%E9%87%8E%E5%A4%96%E7%94%9F%E5%AD%98%E6%8A%80%E8%83%BD