Besides negative thermal expansion, the researchers also found that changes in temperature lead to a significant variation in the porosity of the material, which is therefore highly controllable.

除了负的热膨胀效应，研究人员也发现了温度改变引起的材料多孔性的明显改变，因而这种多孔性就变得高度可控。

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Instead of expanding when heated — as is normally the case — the material contracts, a phenomenon known as negative thermal expansion.

与正常材料不同的是，当加热时，该材料不是膨胀，而是收缩，表现出负的热膨胀现象。

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The expansion of the income gap has both a positive influence and a negative effect.

居民收入差距扩大对我国社会经济既有积极影响，也有消极影响。

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pdv It's an isothermal expansion, so dw is just negative p dV.

因此dw等于负，这就是。

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" But, he said, "Russia has a negative view of NATO's expansion plans.

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The crisis was caused by funding its rapid expansion with debt followed by the negative effects of the recession on consumer spending.

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The unemployment situation is precarious, as "anything from Washington that might seem negative for business may spook management into slowing down expansion efforts and inventory replenishment, " says Marc Lowlicht, wealth management division head at Further Lane Asset Management .

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