But they won't be the level curves of a function for which this is the gradient.

但它们不一定是，某个以该向量场为梯度的函数的等值线。

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To model the ground with the correct heights we used the level curves drawn in the reference drawing.

为了给地面模型设置合适的高度，我们使用从参考图提取的等位曲线。

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OK, so that's where we use, actually, the labels on the level curves that tell us whether things are going up or down.

这就是用标记在等高线的地方，这些标记将告诉我们，到底是在上升还是下降。

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