Progress in mathematic model study for lake eutrophication .

湖泊富营养化数学模型研究进展。

Transaction cost economics ( tce ) has been widely criticized for its lack of adequate mathematic models , so modeling is imperative to tce .

交易成本经济学由于缺乏合适的数理模型而饱受批评，所以建模问题是交易成本经济学迫切需要解决的问题。

The original intention of paper is to carve out a new way based on mathematic model for city water supply price and offer an effective calculation way .

本文研究的初衷就是希望通过具体数量模型的构建，为城市水价的确定开拓一条新思路，同时提供一个有效、实用的理论指导方法。

Thy friend may practice mathematic confidentially when thou dost not see him .

也许你朋友是在你不见他时在偷练数学的。

Are an absolutely valid mathematic occurrence .

绝对是一个有效的数学事件。