An idea is like an itch: you need to scratch it, and when you do it feels better.

头脑里出现的想法就好像是被蚊虫叮了一样：您需要抓痒痒，这样做才感觉舒服一些。

youdao

Dad saw you scratch the car—you've had it now!

爸爸看见你把车身划了—这下可有你好受的了！

《牛津词典》

First of all, there's this large scratch across the front of it.

首先，它前面有个很大的划痕。

youdao

He took some very drastic actions of firing the whole police force and recreating it from scratch.

VOA: standard.2009.09.01

It'll allow you to tackle interesting problems I'll have you to write from scratch, but it does mean that this skill here is going to be really valuable.

它会让你处理有趣的问题,我会让你绞尽脑汁的编写，但是这一点意味着,这个技能非常宝贵。

麻省理工公开课 - 计算机科学及编程导论课程节选

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

So should we turn our backs on Wikipedia -- scratch it and start again?

CNN: Use with caution: The perils of Wikipedia

This new world calls to us to knead it and work it with our hands, to scratch it with our fingernails until it feels right.

FORBES: The Coupe Coup

Tell it in a word doc, or a storyboard, or scratch it with a quill pen on vellum, but whatever you do, create a story first.

FORBES: PowerPoint's Dirty Little Secret