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实验用品缝衣针几根、老虎钳、水等。实验步骤用老虎钳夹住新的缝衣针一端,放在煤气灶(或液化气灶、火炉)的火焰上加热,将缝衣针烧到红热程度,再灼热1～2分钟,然后将缝衣针移开火焰,让它慢慢冷却。待缝衣针冷却后,弯曲该针,就会发现原来十分坚韧的缝衣针已变成像细铜丝那样柔软了,能够随意弯曲,绕着玩。缝衣针已失去原来那种“坚贞不屈”
Experimental supplies several needles, vise, water and so on. The experimental procedure uses a vise to clamp one end of a new sewing needle and place it on the flame of a gas stove (or liquefied gas stove or stove) to heat it. The needle will be heated to the red heat level, and then burn for 1 to 2 minutes. Then the seam will be sewn. Remove the flame from the clothespin and allow it to cool slowly. After the sewing needle cools, bend the needle and you will find that the very tough sewing needle has become as soft as a thin copper wire, and you can bend freely around you. The sewing needle has lost the original kind of “firm and unyielding”