To create a helper superclass that changes the property weight of an object
按照下面的方法，来创建一个帮助者超类（helper superclass），帮助更改一个对象的属性权重
The weight property is set to 0.
weight属性设置为0。
Small size, light weight, excellent self-healing property.
体积小，重量轻，治愈性能优异。
It's structure is jaws mode with the property of little dimension, low-weight.
该电机为爪极式结构，体积小、重量轻。
It's structure is jaws mode with the property of little dimension, low-weight.
该电机为爪极式结构，体积小、重量轻。
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