As said before, with the right equipment and the right know-how, it's possible to jam any wireless transmission.
2016年12月四级真题（第一套）阅读 Section B
英语六级真题
kids who are the first in their families to brave the world of higher education came on campus with little academic know-how and are much more likely than their peers to drop out before graduation.
2015年12月六级真题（第三套）阅读 Section B
柯林斯高阶英汉双解学习词典释义
N-UNCOUNT
（尤指专业或实用的）技巧，技能
Know-how is knowledge of the methods or techniques of doing something, especially something technical or practical.