父亲叫她去摸胡萝卜，她发现它们变柔软了。
He asked her to feel the carrots. She noted that they were soft.
后来，一些人发现把动物的油脂或脂肪擦到皮革的内层，可以帮助皮革变柔软。
Later, someone discovered that animal grease or fat rubbed into the inner side helped the leather to become soft.
第一，折痕表面温度必须超过材料向玻璃过度的温度点，即材料开始变柔软的温度点。
First, the surface temperature of the hinge must exceed the glass transition temperature of the material, which is the point at which the material begins to soften.
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