地区间的税率差别可能导致税基发生变动。
Rate differential across jurisdictions could lead to mobility of base.
当家庭发生变动时，保持学校活动和朋友不变，对你会很有帮助。
When things are changing at home, it can really help to keep some things, such as school activities and friends, the same.
返回布尔值，指明变量变量：已命名存储位置，所包含的数据能够在程序执行过程中发生变动。
Returns a Boolean value indicating whether a variable variable: a named storage location capable of containing data that can be modified during program execution.
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