low mars are poor with low unwind sail
very_low_frequency is radio_frequency. run_low is run. mars_gravity is weaker_than_earths. gravity_on_mars is less_than_of_earth. lower_level is low_level. seas_and_oceans is like_very_low_valleys. low_beam is beam. lowest_level is low_level. low_tide is tide. fellow_traveller_orbit is low_earth_orbit.