Grammar Note
chalk 指白垩/粉笔材料时是不可数名词；指一支粉笔或一种粉笔时是可数名词，复数形式为 chalks。
粉笔
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粉笔
a stick of chalk used for writing or drawing on a blackboard
The teacher picked up a piece of chalk and wrote the math problem on the blackboard.
老师拿起一支粉笔，把数学题写在黑板上。
一种柔软、白色、粉状的石灰石(碳酸钙,CaCO3)
A soft, white, powdery limestone (calcium carbonate, CaCO3).
一种柔软的白色方解石
a soft whitish calcite
一块粉笔,或现今加工压制的石膏(硫酸钙,CaSO4),用于绘画和在黑板上书写
A piece of chalk, or nowadays processed compressed gypsum (calcium sulfate, CaSO4), that is used for drawing and for writing on a blackboard (chalkboard).
一种反射率极低的纯平白色
a pure flat white with little reflectance
We bought colored chalk so the children could draw pictures on the sidewalk.
我们买了彩色粉笔，让孩子们可以在人行道上画画。
She dusted the chalk off her hands after writing the announcement.
她写完通知后，拍掉了手上的粉笔灰。
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chalk 指白垩/粉笔材料时是不可数名词；指一支粉笔或一种粉笔时是可数名词，复数形式为 chalks。
Collins 词频等级为 1，建议结合例句记忆，而不是只背中文释义。
页面下方列出了常见词形变化。学习时注意它们在句子中的语法位置。
Dictionary facts from ECDICT, WIKTIONARY.