丝类是一种纤维蛋白，由蜘蛛或者桑蚕和某些昆虫的腺体所产生。
Silk is a fibrous protein, produced in glands within the spider or silkworm and some insects.
基本上来说，把包含两根金属丝的纤维连接在一根弹簧上。
Basically, you use fibers that contain two metals bonded together in a tiny spring.
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。
As the temperature drops, one metal changes its length more than the other one - resulting in a "curl" in the fiber.
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