火星+/地

In t.\!he distan) t future, a la^,%r=ge po(]rtion of h \umanity lives%, .
on Mars, in @$ci+($ties[+ th@;at resemble th+[.ose on%ce(; fou !.nd on Ea%_rt/\h. The cities[: are .protected from the + inh] os:;pitable Martian atm)[ os!p?=here by ``]]