Class to contain a condition rule that checks whether a context parameter exists.

包含用于检查上下文参数是否存在的条件规则的类。

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The regular patterns of cooking skill teaching include cognition rule, maintenance rule, migration rule, individual condition rule and external condition rule.

必须掌握烹饪技能的教学规律，即认知规律、保持规律、迁移规律、个人条件规律和外部务件规律。

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The knockout condition rule discussed at the start of this article is in fact a business rule, because it is forcing a business constraint — to decline the policy to a high-risk driver.

本文开头讨论的淘汰条件规则实际上就是一个业务规则，因为它是在强制一个业务约束——拒绝高风险驾驶员的保险单。

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The preexisting condition rule places crippling limits on the ability of insurers to create policies based on their best assessment of risk.

FORBES: The Road to Socialized Medicine Is Paved With Preexisting Conditions - Part 3

Mr Chirac's condition would also rule out a president from Ireland, Denmark, Sweden and all ten new member states. (That would put paid to the putative candidacies of Bertie Ahern, the Irish prime minister, and his countryman Pat Cox, the outgoing president of the European Parliament.) The row over the presidency threatens to distract from finalising the constitutional text itself.

ECONOMIST: The summit of all fears | The

Mr. Cuccinelli said the ruling, if upheld, would nullify the pre-existing condition requirement, and the rule that insurers must charge all consumers similar prices.

WSJ: Judge Sides With Virginia on Health Law