mindmap root((进入)) enter the most general of these, may imply either going in or forcing a way in: ~ed the city in triumph. penetrate carries a strong implication of an impelling force or compelling power that achieves entrance: no bullet has ever ~d a vest of that material. pierce adds to penetrate a clear implication of an entering point or wedge: a fracture in which the bone ~s the skin. wedge楔子，一边厚一边薄的工具，用来分离物体 probe implies a penetration to investigate or explore something hidden from easy observation or knowledge: ~d the depth of the sea.