低聲

低 = 亻 + 氐 : Dorothy Gale (di) and Rosa Luxemburg (亻) are in a hopeless situation. They are hanging down (低) from a foundation (氐) floating in front of the space station (Ø1) and away from it. In this hopeless situation their moods are very low (低) and they let their heads hang down (低).

声 = 士 + 尸 + 丨 : Sherlock Holmes (sh) hears the terrifying sound (声) of bone (丨) on stone in front of the engine ((e)ng1), and he's sure that there must be a ghost (尸). Indeed it's only the bachelor (士) who wants to scare Sherlock.