In the cable TV program when 詹生 close the window 窗鉸已經互相踫撞. Test 方法 - 放一張 paper 在窗鉸內 then close the window if paper is broken with a hole it means 窗鉸太緊.
BUT I suggest you to review the cable-TV program to understand what is wrong on it - someone posted the web site to download the TV program.