Sampling issues: clarity about the source and representativeness of samples of evidence that your audience and you are using to form inferences and draw conclusions.
抽样问题:有关源和代表性样品的证据,你的听众和您使用的是形成清晰的推论并得出结论。
A complicated mix of costs, technology and environmental issues means no one source is best.
一个复杂的混合成本,技术以及环境问题意味着没有一种能源是最好的。
Issues surrounding the cold chain were another source of problems.
冷链方面的问题属于另外一个问题根源。
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