也可以定义一个公式来决定要创建的实例。
It's also possible to define a formula for determining the instance to create.
从基点的定义给出厚透镜基点的计算公式。
In this paper, the calculating formulas are put forward from the definition of cardinal point.
推导出理想的信噪比公式时，首先定义信号的均方根。
When you derive the ideal SNR formula, you first define the RMS signal.
推导出理想的信噪比公式时，首先定义信号的均方根。
When you derive the ideal SNR formula, you first define the RMS signal.
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