The type of variable you create determines which attributes of the object are changeable.

该类型的变量创建确定哪些属性的对象是多变的。

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Then define a new attribute of Topic called category with type TopicCategory as changeable with bounds 0-1.

然后，为Topic定义一个新属性，叫做category，类型为Topic category, changeable，范围0 - 1。

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A new type of dual-pulse solid rocket motor concept with an intermediate nozzle is presented and a test motor with changeable structural parameters was designed.

提出了一种带有中间喷管的新型双脉冲固体火箭发动机技术方案，设计了一台结构参数可调的试验发动机；

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