直接计算，我们需要先把曲线参数化。
Well, to do it directly you would have to parameterize this curve.
如果无法对曲线参数化，那么就很难计算线积分了。
If you cannot parameterize the curve then it is really, really hard to evaluate the line integral.
计算它的方式是找到Mdx和Ndy的表达式,然后把曲线参数化。
OK, so the way we compute it is we take this expression Mdx Ndy and we parameterize the curve.
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