chalk dust
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Frame as for watercolours with spacers under the mat to prevent chalk dust from ...
框架至于水彩画与间隔下的垫子，以防止粉笔灰尘从。。。
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The other 5 percent of eggshells consists of a crucial "binding agent" that keeps the chalk from turning into dust and toughens he shells.
蛋壳成分的另外5％是重要的&黏合剂&，可以防止白垩灰化，并增加蛋壳硬度。
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This paper is placed on the piece of wood then covered with chalk dust.
把这张纸覆盖在一块木头上，把白灰撒上去。
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The use of chalk or dust clean blackboard eraser.
答：的粉笔灰尘用干净的黑板擦。
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For instance, one recent report says that pirates in countries such as China and India have used chalk, dust and contaminated water to make counterfeit drugs.
比如说，最近的一份报告就显示，在中国和印度等国家的假冒伪劣商家曾经以白垩、灰尘和污染水为原料来制造假药。
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chalk dust：粉筆灰
"粉笔",,"chalk" | "粉笔灰",,"chalk dust" | "白板笔",,"whiteboard pen"
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chalk dust ph：粉筆灰
concept n. 觀念 | chalk dust ph. 粉筆灰 | regularly adv. 經常地;定期地