沃尔沃EC120D挖掘机的优点包括：1. 高效节能：采用了先进的液压系统和发动机技术，提高了挖掘机的工作效率，减少了燃料消耗，节约能源。2. 灵活机动：具有较小的机身尺寸和良好的转向能力，可以适应狭小的工地环境，灵活性高。3. 操作简便：配备了智能化的控制系统，简化了操作步骤，提高了操作人员的工作效率，降低了操作难度。4. 舒适性好：挖掘机座舱采用了人体工程学设计，提供了宽敞舒适的工作空间，减少了操作者的疲劳感。5. 安全性高：配备了先进的安全控制系统，包括重载保护、翻转保护等功能，提供了更高的安全性和稳定性。6. 维修方便：设计合理的维修接口和易于拆卸的零部件，方便了维修和保养工作，减少了停机时间。总体而言，沃尔沃EC120D挖掘机具有高效节能、灵活机动、操作简便、舒适性好、安全性高和维修方便等优点。

Advantages of Volvo EC120D excavator include: 1. Energy efficient: adopting advanced hydraulic system and engine technology, it improves the working efficiency of the excavator, reduces fuel consumption, and saves energy.2. Flexible and maneuverable: with small body size and good steering ability, it can adapt to the narrow construction site environment, and has high flexibility.3. Easy operation: equipped with intelligent control system, it simplifies the operation steps and improves the operator's working efficiency. It is equipped with intelligent control system, which simplifies the operation steps, improves the operator's working efficiency and reduces the operation difficulty.4. Good comfort: the excavator cockpit adopts ergonomic design, which provides spacious and comfortable working space and reduces the operator's fatigue.5. High safety: it is equipped with advanced safety control system, which includes the functions of heavy load protection and rollover protection, which provides higher safety and stability.6. Convenient maintenance: Well-designed maintenance interfaces and easy-to-remove parts facilitate repair and maintenance work and reduce downtime. Overall, Volvo EC120D excavator has the advantages of high efficiency and energy saving, flexible and maneuverable, easy operation, good comfort, high safety and easy maintenance.