看一下图11中应用程序的复合度。
规则是，一旦引入了关联表，复合度就“交叉”，如图12所示。
The rule is that the multiplicities "cross over" once the associative table is introduced, as indicated in Figure 12.
一对一关联就是它的每个复合度的最大值都是1的这么一种关系。
A one-to-one association is one in which the maximums of each of its multiplicities are one.
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