shadow scratch的用法和樣例：
例句
- A replica technique is used to record the scratch patterns before and after loading.
可採用一種複製技術把在載入前後的划痕圖案記錄下來。 - They can often be used to remove fine or shallow scratches and swirls, but they will not remove any scratch that is deep enough to place your fingernail into.
它們通常可去除淺的或螺旋紋，但它們不能去除深度的划痕，即你用手指可感觸得到的。
