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黑板粉笔

网络blackboard chalk

黑板粉笔

黑板粉笔

黑板粉笔

blackboard chalk

化工引擎_词典查询_chalk slurry ... 白垩、碳酸、钙 chalk 黑板粉笔、 blackboard chalk 碳酸钙试验、 chalk test ...

1

When seeing my interest in painting as a child , my mother bought me a blackboard and chalks , which were in quite a good condition then.

小时候，她看到我喜欢绘画就给我买了黑板、粉笔这些东西，这在当时是很好的条件了。

2

Facts have proved that blackboards and chalks do great harm to the health of teachers and students .

事实证明，黑板粉笔极其有害于教师和学生的健康。

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