“Vulnerable parts” can be described in English as follows, without mentioning any company name:Vulnerable parts are components, sections, or elements within a system, structure, machine, or process that are more likely to be damaged, worn out, or affected by external factors. These parts are usually exposed to stress, friction, heat, moisture, vibration, pressure, or repeated use, which makes them more fragile than other parts. In many cases, vulnerable parts are critical to the normal operation of a product or system, so when they fail, the overall performance may be reduced or completely interrupted.In mechanical equipment, vulnerable parts often include bearings, seals, belts, gears, blades, and filters. These components are subject to continuous movement and contact, which causes gradual wear over time. In electronic devices, vulnerable parts may include batteries, connectors, screens, fans, and circuit elements that can be damaged by power fluctuations, dust, overheating, or physical impact. In buildings and infrastructure, vulnerable parts may refer to joints, pipes, roofs, windows, support structures, and other areas that are exposed to weather conditions, corrosion, and aging.The importance of identifying vulnerable parts lies in maintenance and prevention. By knowing which parts are most likely to fail, users and technicians can inspect them regularly, replace them before breakdown occurs, and reduce the risk of costly repairs or accidents. Preventive maintenance can extend the service life of equipment and improve safety, efficiency, and reliability. For example, if a machine has a belt that wears out quickly, replacing it at the right time can prevent unexpected downtime. Similarly, if a waterproof seal becomes weak, early replacement can avoid leaks and further damage.Vulnerable parts are also important in design and engineering. Designers often try to strengthen these areas by using more durable materials, improving structure, adding protective layers, or reducing exposure to harmful conditions. In some cases, parts are intentionally designed to be easy to replace, so that maintenance can be done quickly and economically. This helps lower long-term costs and makes the overall system more practical.In daily life, understanding vulnerable parts helps people use products more carefully. Avoiding overload, preventing rough handling, cleaning regularly, and storing items properly can all reduce damage to fragile components. Whether in machines, electronics, vehicles, or buildings, vulnerable parts deserve special attention because they are often the first to show signs of wear and failure. Proper care of these parts is essential for maintaining performance, safety, and durability.