vision sharpness

例句：

1. 1. The doctor advised him to maintain good vision by regular exercise.
   医生建议他通过定期锻炼来保持良好的视力。
2. 2.She had a clear vision of the future and was determined to make it happen.
   她对未来有清晰的愿景，并决心实现它。
3. 3.The scientist's research has greatly improved our understanding of the universe's vastness and complexity.
   科学家的研究极大地提高了我们理解宇宙广阔和复杂性的能力。