边界积分方程的离散基于常数元模式。
相当于在一元微积分中，取一个函数的不定积分，仅仅需要在结果后加一个常数。
It is the same thing as, in one variable calculus, when you take the anti-derivative of a function it is only defined up to adding the constant.
大脑解剖实验表明用药的老鼠在称为齿状回的脑部区域生长出三倍于正常数目的神经元。
When dissected, the treated rats turned out to have three times the usual number of newborn neurons in a brain region called the dentate gyrus.
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