第四象限(谨慎、无意)似乎是不存在的—如果您是谨慎的、您有怎么可能疏忽呢？
The fourth quadrant (prudent and inadvertent) seems like it shouldn't exist - if you are prudent, how can it be inadvertent?
本文对该系统进行了研究，并探讨了第四象限制动状态内运行等技术性能，还分析了该系统产生“失控”的原因，提出了解决的措施。
The paper goes into this system, making study of the technical behaviour of the forth quadrant braking state in operation, and analyses the cause of getting out of order, with its solution given.
本文对该系统进行了研究，并探讨了第四象限制动状态内运行等技术性能，还分析了该系统产生“失控”的原因，提出了解决的措施。
The paper goes into this system, making study of the technical behaviour of the forth quadrant braking state in operation, and analyses the cause of getting out of order, with its solution given.
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