Curve-fitting is an art, and a whole article could easily be devoted to it, but look up help fit and the beginners_guide and tips sub-topics to get a start.
曲线拟合是一门艺术，需要用一整篇文章来讲述，但是请参阅 help fit 和 beginners_guide and tips 来对它获得初步了解。
2
According to optimal curve to start-up, boiler drum not only reduces fatigue damage, but also cut down the start-up time.
按优化曲线启动，不仅保证汽包寿命损耗小，而且能大量缩短锅炉启动时间。
3
The life cycle curve portrays the growth of a successful organization (or project) as it moves from start-up through rapid growth and on to maturity.