该组研究人员通过研究化石，发现了后肢长度和骨盆结构变化的证据，这种变化可能使某些黑猩猩更容易直立行走，就像在上述实验中观察到的那只一样。
In the fossil record, the research team found evidence of changes in leg length and pelvic structure that may have made it easier for some chimps, like the one in their study, to stand upright.
他们在一段时间内跟踪一组个体并观察不同的因素导致了什么样的不同结果——在这个研究中，就是癌症的发生。
Their work follows a group of individuals over time and looks at how different factors contribute to different outcomes-in this case, the development of cancer.
几年前他加入这个研究组时，脂肪酸囊泡为标准囊泡，并观察膜泡增长速度。
When he joined the group a few years ago the fatty acid lipid vesicles were already standard.
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