As the temperature drops, one metal changes its length more than the other one - resulting in a "curl" in the fiber.
当温度下降的时候，其中一根金属丝的长度发生改变——引起纤维蜷缩。
A sudden slowing in the rate of temperature increase in a metal being heated, caused by endothermic structural changes and resulting in a darkening of the metal.
吸热（变黑）正在加热中的金属，其温度的升高速度骤然减慢，由吸收了热能的结构变化引起，并导致金属的颜色变黑。
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