单词：scratching
v cause friction
v cut the surface of; wear away the surface of
v scrape or rub as if to relieve itching
v postpone indefinitely or annul something that was scheduled
v remove by erasing or crossing out or as if by drawing a line
v gather (money or other resources) together over time
v carve, cut, or etch into a material or surface
scratching的用法和样例：
例句
- The dog is scratching at the door.狗正在抓门。
- Scratching exacerbates a skin rash.皮疹搔後会恶化。
- We've been scratching our heads for a solution to the problem.我们一直苦苦思索，想找到解决这一问题的方法。
- Stop scratching (yourself).别再搔痒了。
- Scratching the rash will make it worse.丘疹越挠越坏。
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