单词：know-why
专有技术;技术原理
know-why的用法和样例：
例句
- I think buying the know?how is better than the right to use the patent.我想购买专有技术比购买专利使用权要好。
- The know?how tells one all the details of how to manufacture the equipment.专有技术非常详细地说明了如何制造设备。