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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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。

youdao