The great difficulties are that it is rather hard to make such a sine wave inverter as that small as a normal square wave or corrected sine wave auto inverter.

车载逆变器输出正弦波的难点在于，无论是体积还是效率都很难和方波或修正正弦波逆变器媲美。

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We're now scaling up to make cells that will be hundreds of square centimeters-the size of a normal cell.

我们现在正在增加它们的尺寸以使它们达到几百平方厘米——这是正常电池的尺寸大小。

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Normal air pressure is about 15 pounds per square inch.

正常的气压大约是每平方英寸15磅。

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And a graphic artist painting a normal canvas would certainly not have attracted the crowds in Times Square that the female canvases did.

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The fountain, located in the market square, was switched off last week after "higher than normal" levels of legionella were found in the water.

BBC: The water fountain at Northampton's market square

Normal atmospheric pressure varies, but is usually around 14.7 lbs per square inch (psi).

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