In the older parts of the roots, a modified spongy epidermis called velamen has the function to absorb humidity.
在比较根系比较老旧的部分，一种变性的海绵状表皮称为根被有吸收潮气的功能。
Methods of exploring the real number roots of a real coefficient polynomial function are procedurally given.
较程序化地给出了实系数多项式函数实数根的求法。
The paper introduces the property theorem about roots of polynomial and the derivate limit theorem, by which we can study the derived number of a break point of piecewise function.
介绍了用多项式根的性质与导数极限定理求分段函数在分界点的导数的简单方法。
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