Keratomileusis
角膜磨削术
🗣️ 情景例句
Thank you for your understanding and cooperation in this matter.
谢谢你们对此事的理解和合作。
An empty sack cannot stand upright.
空麻袋，立不直。
Modern machines can make the copy bigger or smaller, lighter or darker and copy onto both sides of the paper.
代机器可以放大、缩小、制作较亮的或较暗的复印件，也可以在纸的两面复印。