[{"Bold_text": "noun", "List Items": ["Military.the member of a bombing plane crew who operates the bombsight and bomb-release mechanism.", "History/Historical. artilleryman ."]}, {"Bold_text": null, "List Items": ["a snowmobilelike vehicle driven by an internal-combustion engine, equipped with caterpillar tracks at the rear, steered by skis at the front, and designed for travel over snow."]}]