He traced his hand down the smooth curve of her back.

So what looks like a single smooth curve is really series of smaller S curves.

The shuttle moved into darkness and he saw only a smooth black curve.

It was sort of square, with no smooth gentle curves.

But it is not right because that smooth curve only appears at higher frequencies.

They were well above the smooth blue curve of this world.

In fact, a given smooth curve has only two such orderings.

He ran his fingers lightly down the smooth curve of her back.

I reached out my hand to stroke the smooth black curve of a trunk.

If the fish is suspended in open water with no obstacles around, the lines are smooth curves.