The usual practice is to reserve the word "law" for something that can be formulated in one or two sentences, with at most one simple mathematical equation.
使用“定律”的地方通常是能够使用一两句话至多利用一个简单的数学公式就表达清楚的。
2
Through using the method of questionnaire investigation, interview and mathematical statistics, this paper made analysis on current condition of cultivation talent reserve in key events in Shanghai.
采用问卷调查，访谈，数理统计等方法，对上海市重点项目后备人才培养的现状进行了分析。
3
The technical recoverable reserve of developed ultra heavy oil reservoir is obtained by using iterative method and mathematical model.