When the water level is falling, the free surface line of saturate theory is lower than saturate-unsaturated.

水位下降时，饱和理论比饱和—非饱理论计算的渗流自由面下降要快。

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A practical and effective calculation method of water surface line and bed pressure on curved beds of channels is presented in this paper.

给出了一个实用、有效的曲面急变流水面线及床面压力的计算方法。

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This relates a line integral for one field to a surface integral from another field.

这把一个向量场的线积分，和另外一个向量场的曲面积分联系起来。

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Plus there are several reports that Microsoft will add such a tiny tablet to its Surface line of devices.

CNN: Is the PC dead?

Microsoft has already shown its hand, it wants to strengthen the ecosystem for its Surface line of tablets and Windows 8.

FORBES: Apple And Amazon Should Rejoice As Microsoft Morbidly Embraces Nook

We already know a lot about the Surface tablet line's birthing process.

ENGADGET: Microsoft shows Surface prototypes, teases the tablets that might have been