每个多项式都是可微的，而每个有理函数也是如此。
Every polynomial is differentiable, and so is every rational.
多项式是一种特殊的有理函数，因而具有许多特殊的动力学性质。
As a kind of special rational functions, polynomials have a lot of special and attracting dynamical properties.
该理论所研究的是有理函数而不仅是多次式。
That theory is concerned with rational functions instead of just polynomials.
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