乘法和除法运算符（表 3 中列出的前四个）具有高于加法和减法的优先级。

The multiplication and division operators (the first four listed in Table 3) have higher precedence than the addition and subtraction operators.

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论文在MATLAB环境下，利用其快速的复数矩阵运算功能，实现了文中所提的分层前推回代算法，并取得了非常明显的速度效益。

In this paper, this algorithm is realized by making full use of fast plural matrix operation function of MATLAB, and the increase of that speed is also outstanding.

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采用扩展输入层数据的办法修正了传统的形态开、闭运算三层前馈BP网络模型。

The traditional 3-layer feed forward BP network modal of morphological opening and closing operation was modified by extending the input layer data.

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The next stage is the preoperational stage.

下一个阶段是前运算阶段

耶鲁公开课 - 心理学导论课程节选

The child starts off grasping the world only in a physical way, in a sensorimotor way, but when he gets to the preoperational period, the capacity to represent the world, to have the world inside your head, comes into being.

开始的时候,儿童只能通过生理的方式,通过感知运动的方式,来认识世界,但是当儿童进入了前运算阶段,他们便逐渐拥有了表征事物,在头脑中构建世界的能力

耶鲁公开课 - 心理学导论课程节选