惑星
planet; also written 行星[xing2 xing1]
活性
(chemistry) activity; active; activated
火刑
execution by fire; burning at the stake
活性氧类
activated oxygen species (AOS)
火星哥
nickname of American singer Bruno Mars
火星快车
Mars express, EU spacecraft
火星撞地球
clash that leaves both sides shattered
火星文
lit. Martian language; fig. Internet slang used to communicate secret messages that the general public or government can't understand