So, we want to understand, what's the relation between, let's call dA the area element dxdy in xy coordinates. So, dA is dxdy, dydx maybe dydx depending on the order.
我们要知道，它们之间的关系是什么,把dA设为xy坐标系的面积元素，dA就是，取决于顺序也许就要写成。
So, we want to understand, what's the relation between, let's call dA the area element dxdy in xy coordinates. So, dA is dxdy, dydx maybe dydx depending on the order.
我们要知道，它们之间的关系是什么,把dA设为xy坐标系的面积元素，dA就是，取决于顺序也许就要写成。
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