know-hnw的用法和樣例：
例句
- Certainly I cannot pretend to know special knowledg of electronics.
當然我不能說(shuō)已經(jīng)掌握了電子學(xué)的專(zhuān)門(mén)知識。 - I know that his father was green fingers.
我知道他爸爸很有園藝技能。 - People who love out-door activities should know how to produce a fire with a flint.
用火鐮打火是許多喜歡戶(hù)外活動(dòng)的人需要掌握的技能。
