In the research on the existence and uniqueness of fixed points of operators as well as the method for finding them, the action of the relative lengthened degree was noticed about seventy years ago.
在研究算子不动点的过程中，人们早已注意到算子的相对伸长度在证明其不动点存在唯一性以及寻找不动点中的作用。
Both of them hinge on the principle of "quantitative history". Therefore, the method of quantitative history is indispensable to the research of literary history.
这两者均建立在“计量史学”的原理上，所以在文学史研究工作中有必要引入“计量史学”的方法。
The nutrient balance method was mainly researched on maize fertilizer in the old researches, and most of them stay the level of theory and mechanism without concrete, timely and system research.
在以往的研究中，主要是以养分平衡方法来开展对玉米施肥方面的研究，并多停留在理论与机理上的探讨，缺乏具体性、时效性与系统性的研究，没有更多地将新技术、新方法应用到研究中去。
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