有些玫瑰是双瓣的，有些是单瓣的。

Some roses are double; others are single.

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方法用膝最上动脉的关节支和隐支为蒂的双蒂筋膜瓣包绕清理后的股胫和髌股关节。

Methods Planed femorotibial and patellar joint surface of the hemophilic knee were covered with double fascia flaps pedicled by joint branch and latent branch of top knee arteria.

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注意：双阀瓣止回阀能够安装在水平或流向朝上的垂直位置。

NOTE: Twin Disc Check Valves can be installed horizontally or in the vertical position with flow up.

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