As for the white board equations in the background that have become a staple of each weekly episode, Saltzberg provided classic diagrams and equations describing magnetic monopoles.
Providing an on-board power supply is difficult, however, so he is investigating the use of external magnetic fields to power the device.
然而，倘若板载动力装置很难实现的话，他正在研究利用外部磁场给器件提供动力的途径。
3
"Multi-functional to paint from life bag" "magnetic drawing board " regard carrying and use lover of arts conveniently as blue and green lays and obtain the national patent.