yī / shēng / xiàng / bìng / rén / jiě / shì / zhōng / yāng / āo / shì / shì / wǎng / mó / shàng / fù / zé / qīng / xī / shì / jué / de / qū / yù

医生向病人解释，中央凹是视网膜上负责清晰视觉的区域。

The doctor explained that the fovea centralis is the area of the retina responsible for sharp vision.