【明報專訊】There aren't many people on Mars, which is probably why Esper and Ethro have set up an immigration office here. "We've come on a mission to encourage folks like yourself to immigrate to our lovely planet," Esper said. "For the moment I'm perfectly happy living on earth," Felix said, "but if I should ever think about changing planets, I'll think about immigrating to Mars." To immigrate to a country is to go into it with the intention of taking up permanent residence. (Remember: im + migrate = to enter in.)