沃尔沃EW205 CN4国四挖掘机具有以下几个优点：1. 环保节能：符合国家国四排放标准，采用先进的环保技术，减少了废气和废水的排放，对环境污染更少。2. 高效性能：采用了沃尔沃先进的液压系统和动力系统，能够提供强大的工作能力和高效率的工作性能，提高了生产效率。3. 操作方便：挖掘机配备了智能化的操作系统，易于操作，通过简单的按键即可完成各类操作，降低了操作难度。4. 安全可靠：挖掘机采用了沃尔沃独有的安全保护系统，具有超负荷保护、侧翻保护等功能，提高了作业安全性。5. 舒适性优越：具有宽敞舒适的操作室和座椅，减轻了操作员的疲劳感，提供更好的工作环境。总的来说，沃尔沃EW205 CN4国四挖掘机具有环保节能、高效性能、操作方便、安全可靠和舒适性优越等优点，适合各类工程施工和挖掘作业。

Volvo EW205 CN4 national four excavator has the following advantages:1. Environmental protection and energy saving: it meets the national four emission standards and adopts advanced environmental protection technology, which reduces the emission of exhaust gas and waste water, and causes less pollution to the environment.2. High efficiency performance: it adopts Volvo's advanced hydraulic system and power system, which can provide strong working capacity and high efficiency, and improve the production efficiency.3. Convenient operation: the excavator is equipped with an intelligent operating system, easy to operate, and all kinds of operations can be completed through simple buttons, which reduces the difficulty of operation. 4. Safe and reliable: the excavator adopts Volvo's unique safety protection system with overload protection, rollover protection and other functions, which improves the safety of the operation. 5. Superior comfort: it has spacious and comfortable operator's cab and seat, which reduces the operator's fatigue and provides a better working environment. Overall, Volvo EW205 CN4 national four excavator has the advantages of environmental protection and energy saving, high efficiency performance, convenient operation, safety and reliability and superior comfort, which is suitable for all kinds of engineering construction and excavation work.