Tortillas are usually flat and round, but they can also be made into other shapes.

玉米饼通常是扁圆的，但也可以把它们做成其他形状。

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The water table is not flat but usually follows the contours of the topography.

地下水位是不平坦的，而是通常随地势而变化。

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People with flat feet usually have flexible joints that cause their ankles to roll too far inward at heel-strike.

平足的人通常有灵活的关节，这导致他们的脚踝在脚跟踏地的时候过度的向内翻转了。

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That, says Mr Hodges, means overall costs are usually flat or higher.

ECONOMIST: Outsourcing

The tube-shaped panels, put together on racks, capture more sunlight than flat panels, which are usually tilted in one direction.

FORBES: Magazine Article

Taxpayers usually have a choice: Either deduct a flat 51 cents per business mile (in 2011), or write off IRS-approved depreciation plus actual costs for gas, maintenance and insurance, among other things.

WSJ: Tax Report: The New Tax Breaks for Business Autos