mechanical ptosis

例句：

1. 1. The patient's condition is due to a mechanical ptosis caused by a damaged retina.
   患者的病情是由于视网膜受损导致的机械性下垂。
2. 2.The doctor performed surgery to correct the patient's mechanical ptosis.
   医生进行了手术来纠正患者的机械性下垂。
3. 3. The elderly woman had a mechanical ptosis that made it difficult for her to read.
   这位老人患有机械性下垂，这使她难以阅读。