柳工CLG921E挖掘机具有以下几个优点：1. 强大的功率：柳工CLG921E挖掘机搭载了先进的发动机，具有强大的功率输出能力。这使得它可以轻松处理各种挖掘作业，包括开挖硬质土壤和岩石。2. 高效的作业能力：柳工CLG921E挖掘机具有高效的液压系统，使得其具备出色的作业能力。它能够快速挖掘和移动土方，提高工作效率，并节约时间和人力成本。3. 稳定性强：柳工CLG921E挖掘机采用了稳定性强的设计和技术，可以在各种复杂地形和工况下稳定运行。它具备出色的自平衡能力，不易翻车，提供了更安全、可靠的作业环境。4. 操作简便：柳工CLG921E挖掘机安装了先进的液压操作系统和人性化的控制台设计，使得其操作简便易学。不仅操作员可以轻松掌握操作技能，还能提高工作效率和作业质量。5. 低运营成本：柳工CLG921E挖掘机采用了节能环保的设计理念，具备较低的燃油消耗和排放量，降低了运营成本。此外，它还具备高耐用性和可靠性，减少了维修和保养成本。总的来说，柳工CLG921E挖掘机具有强大功率、高效作业能力、稳定性强、操作简便、低运营成本等优点，适用于各种复杂的挖掘作业。

LiuGong CLG921E excavator has the following advantages:1. Powerful power: LiuGong CLG921E excavator is equipped with an advanced engine, which has a strong power output capability. This allows it to easily handle a wide range of excavation jobs, including digging hard soil and rocks.2. Efficient working capacity: the LiuGong CLG921E excavator has a highly efficient hydraulic system, which gives it excellent working capacity. It is capable of digging and moving earth quickly, increasing work efficiency and saving time and labor costs.3. Strong Stability: LiuGong CLG921E excavator adopts a stable design and technology, which allows it to operate stably in a variety of complex terrains and working conditions. It has excellent self-balancing ability and is not easy to roll over, which provides a safer and more reliable working environment.4. Easy operation: LiuGong CLG921E excavator is installed with advanced hydraulic operating system and humanized console design, which makes its operation easy to learn. Not only can the operator easily master the operation skills, but also improve the work efficiency and work quality. 5. Low operation cost: LiuGong CLG921E excavator adopts energy-saving and environmentally friendly design concepts, with low fuel consumption and emissions, which reduces the operation cost. In addition, it has high durability and reliability, reducing repair and maintenance costs. Overall, LiuGong CLG921E excavator has the advantages of powerful power, efficient working capacity, high stability, easy operation and low operating cost, which is suitable for various complex excavation operations.