30 电子加速器不能将粒子加至光速的原因何在？

答：电子加速器利用电流驱动带电粒子，类似风吹帆动，电流为光速，由于“风帆效应”，被加速粒子难以达到光速（见《L05 E=mc2方程的能量何来？》文）。

30. What is the reason of the electron accelerator can’t add particles to the speed of light?

Answer：the electron accelerator use current drive charged particles, it similar with the wind blow the sail, the speed of current is light velocity, due to “wind-sail effect”, the accelerated particle is difficult reach to light velocity (see article 《L05 Where come from the energy of equation E=mc2 ?》 )