An advanced use of getters is to obtain the values of constants.
getter的一种高级用法是获取常数值。
If you would like to know about more advanced use cases, see Resources.
如果想了解高级的用例，请参阅参考资料。
Some tips on the advanced use of Screen such as this are presented later.
稍后会提供一些关于Screen的高级用法的提示。
This function is for advanced use only, not normally needed.
除非特殊的需要，一般情况下不需要使用该函数。
This function is for advanced use only, not normally needed.
除非特殊的需要，一般情况下不需要使用该函数。
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