复杂的现代电梯设备，工程师正在解决问题，并思考要更换哪个部件。男工人感到沮丧，因为他不知道如何修复这

modern elevator equipment, the engineer solves the problem and thinks about which part to replace. The male worker is upset that he does not know how to fix the problem. A utility service engineer inspects the equipment of a passenger elevator. The elevator doors are open, the engineer is looking for a solution to the correct repair. A man checks wear and tear on parts to ensure the safety of the home occupants. Engineer in uniform and protective helmet.