chalk dust meaning in English

粉笔末

When you iive in the basement , you breathe in a iot of chalk dust
当你住在地下室你吸进去很多粉笔粉
Yes , the classroom is always a comfortable working condition except some chalk dust still
是的，课室虽然还有粉笔尘，但仍然是很舒适的工作环境。
After the horseplay by the wicked students , the classroom floor was strewn with crumbled chalk dust
那班顽皮学生闹著玩儿，捏碎不少粉笔，过后，教室地板上撒满了粉笔灰。
Before the advent of the standard model , physicists had become used to experiments producing unexpected new particles or other signposts to a new theory almost before the chalk dust had settled on the old one
在标准模型出现之前，物理学家已经习惯从实验中，接二连三地发现预期之外的新粒子，或是指向新理论的路标。