scratch up

基本解释

Jo: Will she scratch up your back?
乔：她会抓你的背吗？
No, because the ash—the ash is pulverized rock—it can scratch up the windshield, too.
不行。因为火山灰是岩石微粒，也可以刮伤挡风玻璃。
No sharp edges anywhere on the tip so it will not scratch up your screen.
顶端任何一处都没有锋利的尖，所以它不会刮坏你的屏幕的。

So it's generally called distribution code and whereas for the previous problems that you pretty much started from scratch, blank files you opened up nano and there was nothing there unless you put it there.
它一般被称作分布码，然而,对于之前几乎要从头做起的问题,在空白文件中什么都没有,除非你在里面写入些东西。
哈佛公开课 - 计算机科学课程节选

And that'll be one sad day if you scratch up this beauty at all.
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