研究表明，如果给定15分钟的自由玩耍时间，四到五岁的孩子会将其中三分之一的时间花在有关空间、数学和建筑的活动上。
Research shows that given 15 minutes of free play, four- and five-year-olds will spend a third of this time engaged in spatial, mathematical, and architectural activities.
为了研究列车中各车辆在直线上和大半径圆曲线上的蛇行稳定性，建立了具有17个自由度的车辆系统非线性数学模型。
In order to study the straight and circular curved track stability of each vehicle in the train set, a mathematical model of vehicle system with 17 freedom degrees was set up.
本文，我们研究了在药物作用下未血管化肿瘤生长的数学模型，该模型是一个偏微分方程的自由边界问题。
In this paper we study a free boundary problem modelling the growth of an avascular tumor with drug application.
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