例如，更多人民能不再买得起坚实橡木楼梯，虽然他们曾经是相当共同在更旧的家。
For example, more people can no longer afford solid oak stairways, although they were once fairly common in older homes.
总之，伺服驱动器从无到有的技术突破，作者取得了相当的成果，为后续的工作打下的坚实的基础。
In general, some key techniques related with PMSM servo driver are broken through, which put a very good foundation for next work.
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