求翻译：A set of 14 LDN-DS lines have subsequently been backcrossed with LDN for 5 additional backcrosses to reduce the residual background. Nine of the是什么意思？

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A set of 14 LDN-DS lines have subsequently been backcrossed with LDN for 5 additional backcrosses to reduce the residual background. Nine of the

问题补充：

匿名	2013-05-23 12:21:38 14 LDN - DS线，随后被回交5回交，以减少残留的背景与LDN。九名

匿名	2013-05-23 12:23:18 一套14LDN MCR接入-DS线backcrossed后来已与LDN MCR接入额外backcrosses为5,减少剩余的背景。 9个的

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38 随后有被一组 14 LDN-DS 线条 backcrossed 与降低残留背景的额外 5 backcrosses LDN。九

匿名	2013-05-23 12:28:18

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