本文将铁路轨道看作由钢轨和轨枕组成的双层弹性系统，用两个偏微分方程联立描述其振动。
In this paper the railway track is considered as a double elastic system of both rails and sleepers and the vibration is described in detail with two partial differential equations.
利用微元段内的物料与热量平衡，对固定化酶管式热敏传慈器进行了考察，建立了用联立双曲型偏微分方程组描述的数学模型。
By means of the material and energy balances, this paper establishes a mathematical model to describe the tubular hot-sensitive sensor with immobilized enzyme.
利用微元段内的物料与热量平衡，对固定化酶管式热敏传慈器进行了考察，建立了用联立双曲型偏微分方程组描述的数学模型。
By means of the material and energy balances, this paper establishes a mathematical model to describe the tubular hot-sensitive sensor with immobilized enzyme.
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