Because different team members may take different amounts of time to complete a task, it hardly makes sense to finalize a time estimate without an assignment.
因为不同的队员，完成一项任务所用的时间是不同的，所以在没有一项分配方案的情况下，很难合理地完成一次时间评估。
Code that makes common use of static fields or other means of caching data is unsafe for scopes because of the assignment rules, which can result in an IllegalAssignmentError.
由于分配规则的限制，通常使用静态字段或其他缓存数据方式的代码会使范围不安全，可能导致IllegalAssignmentError。
A new assignment makes an existing variable refer to a new value (and stop referring to the old value).
一次新的赋值使得已有的变量获得新的值(也就不再有旧的值了。)
A new assignment makes an existing variable refer to a new value (and stop referring to the old value).
一次新的赋值使得已有的变量获得新的值(也就不再有旧的值了。)
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