cement layer的用法和樣例：
例句
- In LASIK, a flap is cut in the stromal layer and the flap is folded back.
而激光輔助原位屈光性角膜成形術使用的方式是切入基質層，創建一個折邊，再將折邊反轉過來，露出基質層。 - The outer lipid layer is an oily film that seals the tear film on the eye and helps to prevent evaporation.
外面的脂質層是一層油性膜，它將淚液膜封在眼球上，幫助阻止蒸發。
