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 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。
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