scratch board的用法和样例：
例句
- To adjust the height of flashboard to control the liquid level and make the useful froth scraped by loam board.
调节闸板高度，控制液面，使有用泡沫被刮板刮出。 - This paper introduces the fault treatment and improving situation of scraping transporter with round-link chain and glass-ceramic sheathing board in coal washing plant.
介绍了圆环链铸石衬板刮板运输机的故障处理及改进情况。
