最简单并且最常用的预测条件是查询候选类。

The simplest and often used projection term is the candidate class of the query itself. It can be implicit, as shown in Listing 11.

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清单13中的方法构建了一个由其他几个可选择的表达式组成的预测条件。

The methods in Listing 13 build a compound projection term composed of other selectable expressions.

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相反，不可预测的不利条件会给生物体带来相当大的隐患。

In contrast, unfavorable conditions that occur unpredictably pose considerable problems for organisms.

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It predicts that the best timing is when the conditioned stimulus, which is the signal, comes before the unconditioned stimulus, which is what you have to prepare for.

它预测，最佳的时机,莫过于作为信号的条件刺激，出现在需要你做准备的，非条件刺激之前。

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