yán jiū rén yuán / tōng guò / xiǎn wēi jìng / guān chá / nǎo suǐ / yàng běn / zhōng / de / shén jīng / xì bāo / biàn huà研究人员通过显微镜观察脑髓样本中的神经细胞变化。Researchers used a microscope to observe changes in nerve cells in brain tissue samples.