Scratch

1 抓 挠

The dog scratched itself behind the ear 这只狗挠了挠它的耳朵后面

2 白手起家

If you do something from scratch, you do it without making use of anything that has been done before

eg: Ben built a new company from scratch last year, it is closed down this year

3 adj,adjective

The results  of the Calculating  are still on the scratch paper, no one knows what  it means 

cover 

1 noun 盖子

2 掩护，遮盖

Cover me while I move forward

She covered her face with her hands.

He covered up the body with a sheet.

3 掩盖事实

Lies cannot cover up  the facts

You shouldn‘t try to cover up your mistakes

4 赔偿损失

the insurance will cover the loss of my bike was stolen