Riding the beam from a powerful laser, a sail could even make the journey to another star system in 100 years, that is to say, a human lifespan.
通过驾驭强大的光源，太阳帆可以在100年内抵达另一个星系，也就是说在一个人的寿命范围内。
2
Albert Einstein once imagined riding on a light beam, and his thought experiment led him to the theory of special relativity.
爱因斯坦曾经幻想在宇宙中乘着一道光线飞驰，这个思想实验为他的狭义相对论奠定了基础。
3
Beamriding systems use a target tracker whose purpose is to maintain the antenna boresight pointing at the centre of the reflecting area of the target.