One source may be a primary reference while the other source utilizes the data.
一个源可能是一个主引用，而其他源利用它的数据。
The Contract unit will be one currency unit of the primary reference currency.
合约单位为一个主要参考货币的货币单位。
The Control Valve Handbook has been a primary reference since its first printing in 1965.
此控制阀手册从1965年第一次印刷起，就已经是一个主要的参考资料。
The paper introduces the system design and operation principle of the primary reference clock equipment.
介绍了基准时钟的系统设计及工作原理。
The controller keeps a reference to the primary instance of the model.
控制器保留对模型主实例的引用。
If the target is an attribute reference: the primary expression in the reference is evaluated.
如果目标是一个属性引用：引用中的主元表达式被求值。
If the target is an attribute reference: the primary expression in the reference is evaluated.
如果目标是一个属性引用：引用中的主元表达式被求值。
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