The installations tested were of two kinds, each in duplicate.

试验中采用的装置有两种，每一种两份。

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Certificate of Quality and Quantity, each in duplicate, issued by the manufacturers (sellers).

由制造厂(卖方)签发的质量、数量证明书各两份。

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In such instances, you can duplicate the use case, assign each use case one primary persona, and create a separate user interface for every use case.

在这种情况下，您可以复制用例，为一个主要角色分配每个用例，并为每个用例创建分开的界面。

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