I twist my neck, trying to catch her expression, but I can see only half of it: flutter of eye, curve of lip, and slice of cheek.
我扭转脖子，想看看她的表情，可也只能看到一半儿：眼睛的煽动、嘴唇的弧度，面颊的一片儿。
OK, so the way we compute it is we take this expression Mdx Ndy and we parameterize the curve.
计算它的方式是找到Mdx和Ndy的表达式,然后把曲线参数化。
Engineering applications, the interpolation and regression (curve fitting) function expression usually are used to describe data to solve the problem.
工程应用中通常用插值和回归(曲线拟合)解决函数表达式描述数据的问题。
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