The balloons must first be heated to regain their elasticity, which is robbed from them in storage by the -4 degrees Fahrenheit surface temperatures in the southern hemisphere's summer.

这些气球在使用前都要经过加热出来，以恢复弹性。即使是南半球的夏天，南极站附近的温度也只有- 4华氏度(- 20摄氏度)，气球都会冻得失去弹性。

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In this paper, elasticity polishes material using polyurethane for polishing arbitrarily curred surface is presented.

提出了一种磨削抛光任意曲表面的聚氨酯弹性磨具材料。

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The elasticity module of ADI is lower than that of steels, so that the surface contact stress borne by ADI gears during working process would be lower than steels.

奥贝球铁材料的弹性模量比钢小，因而奥贝球铁齿轮工作时受到的表面接触应力比钢齿轮小。

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