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1. We have tried to present in this book an accurate and up-to-date picture of the scientific community and the people who populate it.
【结构分析】句子主干为：We have tried to present an accurate and up-to-date picture;“of the scientific community and the people who populate it”为介词of引导的短语充当“an accurate and up-to-date picture”的后置定语，其中“who populate it”为who引导的从句充当“the people”的后置定语。
2. In a double-blind trial of an arthritis drug, neither the study subjects nor the experts evaluating them know which ones got the test treatment and which a dummy pill.
【结构分析】句子主干为：neither the study subjects nor the experts know which ones got the test treatment and which a dummy pill，其中两个which分别引导从句充当“know”的宾语;“evaluating them”为分词短语充当“the experts”的后置定语;“In a double-blind trial of an arthritis drug”为地点状语。
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