Learning on 10/21/2025
汉语 読書 土木Oct 20, 2025, 4:01:13 PM
  Study time: 2 minute(s) 
  Today's learning: 15 
  Consecutive study days: 1415
  Difficult review: 1 
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Oct 20, 2025, 4:01:13 PM
  Study time: 2 minute(s) 
  Today's learning: 15 
  Consecutive study days: 1415
  Difficult review: 1