One of the primary sources of bugs occurs when variables change states.
变量状态改变是产生bug的一个主要来源。
When the first and second soft goals change, the types of availability variables change.
当第一或第二软目标更改时,可用性变量的类型将更改。
When the first and second soft goals change, the types of availability variables change.
当第一或第二软目标更改时,可用性变量的类型将更改。
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