吃过晚饭，继续谈话，一直到晚上（注意主语先行，定语从句先行词不要重复）
After dinner. the four key negotiators resumed their talks, which continued well into night.
分析：主语：Americans；谓语：say；that引导一个宾语从句，还包含有一个省略了关联代词的定语从句，a person can be sure in life修饰two things. 当先行词在定语从句中作宾语时，常可省略。
Americans often say that there are only two things a person can be sure of in life: death and taxes.(*)
在这样的实验中，能够训练昆虫飞向紫外线，而紫外线对我们来说只是一片黑暗。(非限制性定语从句后置，重复先行词)。
In such an experiment the insects can be taught to fly to the ultra-violet, which for us is just darkness.
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