lubricating oil quality 油品质量
·2,447,543篇论文数据，部分数据来源于NoteExpress
Another factor lubricating the path to physician employment is generational: Doctors now in training appear willing to forsake income for a better quality of life and are less interested in the entrepreneurship required to run a private practice.
WSJ: David Leffell: The Doctor's Office as Union Shop
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