Such a complex association between creatures of four species has the hallmark of an ecologic happy family.

四种动物之间这种复杂的结合是生态学幸福家庭的标志。

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"Table per Concrete Class using implicit Polymorphism" is not recommended due to its verbose configurations, complex association syntax using "any" element and potentially dangerous implicit queries.

“使用隐式多态实现每个具体类一张表”这种做法并不推荐，因为其配置过于繁缛、使用“any”元素的复杂关联语法和隐式查询的潜在危险性。

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A complex but non-significant association was found between water supply and pupal counts, and lack of waste disposal services was associated with higher vector abundance in only one site.

我们发现，水的供应和蛹的数量之间存在复杂但非重大的关联，没有水处理设施只在一个地点与较高的病媒丰度存在关联。

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Free Americans developed complex webs of association based on voluntary agreement.

FORBES: The "On Your Own" Economy

There was already friction within this habitually tight-lipped community, because many firms who were using the Rana Plaza complex have yet to admit their association - in contrast to Primark and Canada's Loblaws, which were quick to come out and promise compensation.

BBC: News - Dhaka Rana Plaza collapse: Pressure tells on retailers and government

The Association of School and College Leaders has warned that confusion over its complex structure and a low take-up rate could doom the qualification to second-class status.

BBC: Heads demand answers on Diplomas