Here, you integrate only over a two-dimensional surface, and here, only a one-dimensional curve.
在这儿，只是在一个二维曲面上做积分，这里是一维曲线。
However, most simple curve plotters are insufficient for plotting two-dimensional data or for exerting detailed control over a complicated graph.
但是大多数简单的曲线绘图仪在绘制二维数据方面或者在复杂的图形中进行极为精细的控制方面显得很不足。
Remember not so long ago we looked at flux of a two-dimensional field of a curve.
记得之前我们曾经学过，二维空间中曲线的通量。
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