单语范例（未经PONS编辑处理）
英语
- The portion of the R cells at the central axis of the ommatidium collectively form a light guide, a transparent tube, called the rhabdom.en.wikipedia.org
- The drosophila ommatidium contains 8 distinct retinula or R cells, each of which has a different spectral sensitivity.en.wikipedia.org
- These R cells tightly pack the ommatidium.en.wikipedia.org
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