本文仔细研究了分支水平井产能公式的架构过程，发现存在两处理论缺陷和三次数学近似。
The process of structuring the multi-lateral horizontal well productivity formula was carefully studied, and two theory defects and three mathematical approximation were detected.
本文给出了天体物理学中辐射转移方程的几种近似解法，讨论了数学近似和物理条件如何吻合，发现：数学上的近似常常不影响物理上完整和自洽。
This, paper gives some approximative solving methods of radiative transfer equation in astrophysics. It is found that mathematical approximations of ten are complete and accurate in physics.
对于数学题，你可以用近似法省时间。
With mathematical problems, you can save time by approximating.
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