在现实中，关联集可以由多个属性的多个个体集合组成，但为了简单起见，那些额外的复杂性略去不谈。
In reality, correlation sets can be composed of many individual sets of many properties, but that extra complexity is left our for clarity.
集合级安全性用来关联集合与授权用户组。
Collection level security is used to associate collections with sets of authorized users.
而且值得注意的是，YAML保留着有序集合和关联集合之间的区别。
And, significantly, YAML maintains the distinction between ordered and associative collections.
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