癥结zhēng jié

painful abdominal mass

• instructional television
• instrument
• instrumental
• instrument landing system
• instruments
• instruments，aircraft
• insubordinate
• insubstance
• insufferable
• insufficiency
• insufflate
• insular
• insulate
• insulation
• insulation，electrical
• insulation，heat
• insulator
• insulin
• insull，samuel
• insult
• insulting
• insuperable
• insupportable
• insuppressible
• insurance