Whenever physics classes at NTU, National Taiwan Normal University, or the Tatung Institute of Technology study the principles of the laser, the helium-neon laser tubes they use in their labs have no other source-they've been blown by Hsu Yu-ch'uan.
台灣大學、師範大學、大同工學院等校的物理課，只要上到雷射原理，實驗室裡用到的氦氖雷射管，沒有別的來源，一定是許玉釧吹的。