Use the standard variable declaration syntax to declare a reference.
请使用标准的变数宣告语法来宣告参考。
The standard way to define an environment variable under bash is
在 bash 中定义环境变量的标准方法是
Another type of standard candle is a type of star called a Cepheid variable.
另一种标准烛光是一种叫做造父变星的恒星。
Another type of standard candle is a type of star called a Cepheid variable.
另一种标准烛光是一种叫做造父变星的恒星。
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