地平.+线系列：火星旅( ^行者指南

The%]) dream of send/ing -h?#=umans t o M$[/*ars is close/-r than#*? e#?ver ( bef ^ore.  In fact, many@^ s$c`ient%_-i?sts think that the first person to set foot on the $.$Red Planet :is al_-.@ive tod#:a\-y,#. But ? where s,:!ho$uld the first expl!orers@ v%i)sit when they get ther,*e?
　　(Horizo/n has `gathered t-:(h`e world's leading ex##(perts on Mars and` ::aske?d 
the=%m: whe
/re_^= wou`.ld/( they -^go, if they got the c#^%@hanc;e -
@ and what would th\\.ey need# to s
?u#r^+viv...