The municipal water supply networks, is very difficult to determine the line of a curve.

而在市政供水管网中，则很难得到一条确定的管路特性曲线。

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Isoquant curve is a line showing all the alternative combinations of two factors that can produce a given level of output.

等产量线是表示两种生产要素的不同数量组合可以带来相等产量的一条曲线。

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A less dramatic curve will still encourage the viewer to follow the flow of a line, but it will have less energy.

不那么明显的曲线依然会促使观者注视线条的走向，只不过活力稍欠而已。

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To create a faux molding, a straight edge and pencil are used to draw a line, then shading is added with paint to give the look of a curve.

WSJ: An Artisan Who Can Turn Paint into Stone | Creating

In addition to mastery of traditional calligraphy, the art of engraving requires a high degree of virtuosity, since the artist works on a tiny surface area where every curve, every thickness of line counts.

UNESCO: Culture

They found that it made sense to buy long bonds in almost all interest-rate scenarios but one: when rates are low (so the risk that they will revert to the mean, thus undercutting the value of the bond, is high) and the yield curve a line drawn through the interest rates on government securities with different maturities is flat (so there is little extra reward for taking that risk).

ECONOMIST: Buttonwood