一个伴着计算器长大的学生既要对付解题策略，又要对付实际运算。
A student who has grown up with a calculator will struggle with both strategies and computations.
学会心算的学生能把注意力集中到如何解题上，然后轻而易举地完成实际运算。
A student who learns to handle Numbers mentally can focus on how to attack a problem and then complete the actual calculations easily.
本方法直接估计线性系统参数，不需将模型正规化，从而节省了实际运算时间。
And the method directly estimates parameters without standarizing the model, so that saves the operational time in practice.
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