Cut a 4-inch square out of the cardboard.
从硬纸板上剪下边长为4英寸（约10.16厘米）的正方形。
PRESSURE】The air pressure at sea level is nearly 15 pounds for each square inch.
海平面上的大气压力每一平方英寸约有十五磅。
Make sure to cover every square inch of the glass.
保证每寸玻璃都擦到。
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。
But save square inch ground, stay with descendant Geng.
但存方寸地，留与子孙耕。
But save square inch ground, stay with descendant Geng.
但存方寸地，留与子孙耕。
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