[单选题]
One 20-year-old twinno w u-ll h 2q0zk f8m*s9akmf.5.uz;h brother takes a space trip with a speed of 0.80c fs+8e3umybig x j 9(w/uor 30 years according to a clock on the spaceship. Upon returw3u + egixu/(my8sbj 9ning to the Earth, what is his own age and the age of the Earth-based twin brother?
Post time 2024-1-14 16:03:04