1. Carbon is an element that exhibits allotropic properties, with forms such as diamond, graphite, and fullerenes.
碳是一种具有同素异形性质的元素，存在着钻石、石墨和富勒烯等形式。

2. Allotropic transitions can be induced in certain metals by changes in temperature or pressure.
某些金属在温度或压力变化下可以诱导发生同素异形转变。