三一重工SY35C（国四）挖掘机的优点包括：1. 卓越的性能：SY35C挖掘机搭载了高效的液压系统，能够提供强大的挖掘力和提升力，具有卓越的工作性能。2. 灵活性强：SY35C挖掘机采用紧凑设计，机身轻巧，便于在狭窄的工地和城市街道上操作，具有良好的灵活性。3. 舒适性高：SY35C挖掘机的驾驶室设计人性化，空间宽敞，座椅舒适，噪音低，振动小，为操作人员提供舒适的工作环境。4. 节能环保：SY35C挖掘机引擎符合国四排放标准，具有较低的废气排放和燃油消耗，能够节约能源并减少对环境的影响。5. 维护方便：SY35C挖掘机的维护点布局合理，易于维修和保养，减少了维护成本和停机时间。6. 安全性高：SY35C挖掘机采用多重安全保护装置，如翻转防护结构、门锁装置等，保障了操作人员的安全。总体来说，三一重工SY35C（国四）挖掘机具有性能优越、灵活性强、舒适性高、节能环保、维护方便和安全性高等优点。它是一款可靠高效的挖掘机，适用于各种工程和建筑项目。

The advantages of Sany SY35C (National IV) excavator include:1. Excellent performance: SY35C excavator is equipped with a highly efficient hydraulic system, which can provide strong digging and lifting force, and has excellent working performance.2. Flexibility: SY35C excavator adopts a compact design with a lightweight body, which is easy to operate in narrow construction sites and city streets, and has good flexibility.3. High comfort: SY35C excavator's cab is humanized in design, with spacious space, comfortable seats, low noise and vibration, providing a comfortable working environment for operators.4. Energy saving and environmental protection: SY35C excavator's engine complies with the National IV emission standard, with low exhaust emission and fuel consumption, which saves energy and reduces the impact on the environment.5. Convenient maintenance: SY35C excavator's Maintenance points are well laid out and easy to repair and maintain, which reduces maintenance costs and downtime.6. High safety: SY35C excavator adopts multiple safety protection devices, such as rollover protection structure, door locking device, etc., which guarantees the safety of operators. Overall, Sany SY35C (National 4) excavator has the advantages of superior performance, flexibility, high comfort, energy saving, environmental protection, easy maintenance and high safety. It is a reliable and efficient excavator suitable for various engineering and construction projects.