Notarized highest education diplomas attained or proof of study.

经过公证的最高学历或在校学习证明。

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You should study the outcome of the proof of concept carefully before providing an estimation.

在提供正式的估计之前，应该仔细研究这个概念证明的结果。

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The team is also working to find a more commonplace, less-expensive material for the catalyst, to replace the relatively rare and costly iridium used in this proof-of-concept study.

该小组还正在努力寻找一种更常见的，更便宜的催化剂，以代替在验证性概念研究中使用的相对昂贵和稀有铱催化材料。

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"As the art of bariatric surgery has evolved, it's become safer, and this study is proof of that evolution, " he said.

CNN: Weight-loss surgery safe, but sleep apnea increases risk

Karen Addington, chief executive of Juvenile Diabetes Research Foundation, who funded the research said the study provided "proof of principle" of an artificial pancreas.

BBC: Artificial pancreas hope for children with diabetes

Dr Lorenz Studer, head of the Stem Cell and Tumor Biology Laboratory at the centre, and the lead researcher on the study, told BBC News Online that the study was "proof of principle" that cloned embryonic stem cells could be reliably transformed into a variety of useful cell types.

BBC: NEWS | Health | Mouse cloned to cure Parkinson's