【주요 어휘 정리】 • device: 장치, 기구 — A smartphone is a very useful device for communication. • cable: 케이블, 굵은 전선 — The thick cable connects the two buildings and carries electricity. • insulate: 절연하다, 단열하다 — We use rubber to insulate wires to prevent electric shocks. • hook: 갈고리 — The crane lifted the heavy box with its large hook. • construct: 건설하다 — The company will construct a new office building next year. • invent: 발명하다 — Thomas Edison invented the light bulb.