GRE，全称Graduate Record Examination，中文名称为美国研究生入学考试，适用于除法律与商业外的各专业。由美国教育考试服务处(Educational Testing Service，简称ETS)主办，GRE是美国、加拿大的大学各类研究生院（除管理类学院，法学院）要求申请者所必须具备的一个考试成绩，也是教授对申请者是否授予奖学金所依据的最重要的标准。 另有，Generic Routing Encapsulation（通用路由封装）也简称GRE。
This magazine article concludes that the 8 million cans of tuna Promofoods recalled, due to
complaints about nausea and dizziness, do not after ail contain any chemicals that pose a
health risk. To support this conclusion the author cites the fact that five of eight chemicals
commonly causing these symptoms were not found in the recalled cans, while the other three
also occur naturally in other canned foods. For several reasons, this evidence lends little
credible support to the author's conclusion.
To begin with, the author relies partly on the fact that, although three of the eight chemicals
most commonly blamed for nausea and dizziness appeared in Promofoods' recalled tuna,
these chemicals also occur naturally in other canned foods. However, this fact alone lends no
support to the author's conclusion, for two reasons. First, the author might be ignoring an
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important distinction between "naturally occurring" chemicals and those not occurring naturally.
It is entirely possible that these three chemicals do not occur naturally in Promofoods' tuna,
and that it is for this reason that the chemicals cause nausea and dizziness. Secondly, it is
entirely possible that even when they occur naturally these chemicals cause the same
symptoms. Unless the author rules out both possibilities, he cannot reliably conclude that the
recalled tuna would not cause these symptoms.
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