【明報專訊】The folks on Mars received a message from the folks on earth. "Maybe we should answer to them," someone said. "Wouldn't they be surprised!" "But in what language would we answer to them?" Esper asked. That presented (呈現) a problem so in the end it was decided not to answer to the people on earth. Answer to is to respond to someone's action, letter, request (要求), etc.