求翻译：Although associations and aggregations are bi-directional by default, it is often desirable to restrict navigation to one direction是什么意思？

待解决

悬赏分：1 - 离问题结束还有

Although associations and aggregations are bi-directional by default, it is often desirable to restrict navigation to one direction

问题补充：

匿名	2013-05-23 12:21:38 虽然协会和聚合是双向默认情况下，它往往是可取的限制导航到一个方向

匿名	2013-05-23 12:23:18 虽然协会和聚合都是双向默认情况下,它往往是在一个方向导航最好限制

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38 虽然协会和聚合是双向默认情况下，通常最好是限制到一个方向导航

匿名	2013-05-23 12:28:18

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