On-site operation test shows that the research oil has an evident edge over the original hydraulic transmission oil.

在现场运行试验中，研制油的性能比参比油有显著提高。

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Due to the need of hydraulic transmission oil source, the structure is relatively large and complex, and there is a certain pollution to the environment.

由于液压传动需要油源，结构相对庞大和复杂，且对环境有一定污染。

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Water hydraulic drive system has some advantages of oil hydraulic transmission such as large power, high efficiency and compact structure as well as the unique advantage of environment-protection.

水压驱动系统既保持了油压传动传递动力大、效率高和元件体积小的优点，又兼有环保的积极作用。

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