[单选题]
One 20-year-old twin brotp 0x-f44 8toy0fi3mo 1d-jl1mh pmihn hec na4 7f*n8te pf,ves5r takes a space trip with a speed of 0.80c for 30 years according to a clock on the spaceship. Upon returning to the Earth, what is his own age and the ag4pnf5v78cee,*fnt sa e of the Earth-based twin brother?
Post time 2024-1-14 16:03:04