To define a data field in the _email action object as a constant value.
要将_email操作对象中的数据字段定义为常数值，请执行以下操作。
The Subject data field will be evaluated as the constant value.
Subject数据字段将评估为常数值。
The physical property of oscillator driven by quasi-constant field is studied.
研究了准恒场驱动谐振子的物理特性。
The physical property of oscillator driven by quasi-constant field is studied.
研究了准恒场驱动谐振子的物理特性。
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