导出了电子获得加速所需的激光强度阈值及相应的电子能量增益的一般解析表达式。
The general formulae which represent the critical intensity of the laser pulse for the acceleration and the corresponding energy gain of the particles are derived.
采用自相似函数的方法可以获得解析解的一般表达式。
The general expressions of analytical solutions are obtained by the methods of self-similar functions.
在本文中，首先提出了用近似的解析表达式定量描述气候要素场的一般问题。
In this paper, the author firstly proposes the generalized problem of the quantitative description of climatic field by means of approximate analytic expression.
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