As said before, with the right equipment and the right know-how, it's possible to jam any wireless transmission.
2016年12月四級真題（第一套）閱讀 Section B
英語六級真題
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月六級真題（第三套）閱讀 Section B
柯林斯高階英漢雙解學習詞典釋義
N-UNCOUNT
（尤指專業或實用的）技巧，技能
Know-how is knowledge of the methods or techniques of doing something, especially something technical or practical.