a piece of chalk
chalk 表示“粉笔”时通常不可数，计量时用 a piece of chalk 或 a stick of chalk。
The teacher picked up a piece of chalk and wrote the date on the board.
老师拿起一支粉笔，在黑板上写下了日期。
粉笔
chalks — plural of chalk
白垩；划粉；裁缝粉笔；防滑粉；镁粉；白垩色；粉白；冰毒；甲基苯丙胺
a stick of chalk used for writing or drawing on a blackboard
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
裁缝用粉笔
Tailor's chalk.
一种苯丙胺衍生物(商品名 Methedrine),以结晶盐酸盐形式使用,用作神经系统兴奋剂和食欲抑制剂
an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant
一种白色粉状物质,用于防止攀岩时手从抓握处滑落,或在举重或体操中失去抓力,有时但不总是石灰石粉笔,通常是碳酸镁(MgCO3)
A white powdery substance used to prevent hands slipping from holds when climbing, or losing grip in weight-lifting or gymnastics, sometimes but not always limestone-chalk, often magnesium carbonate (MgCO3).
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。
用法提示：chalk 此处为不可数名词，用 a piece of chalk 表示“一支粉笔”。
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。
用法提示：chalk 作为物质名词，指用于绘画的粉笔材料。
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。
用法提示：chalk 在此指书写后残留在手上的白色粉末。
chalk 表示“粉笔”时通常不可数，计量时用 a piece of chalk 或 a stick of chalk。
The teacher picked up a piece of chalk and wrote the date on the board.
老师拿起一支粉笔，在黑板上写下了日期。
in chalk 表示“用粉笔（写、画）”，强调书写的材料或方式。
The café's specials were written in chalk on a blackboard.
咖啡馆的特色菜用粉笔写在黑板上。
chalk 可直接置于另一名词前作定语，如 chalk dust（粉笔灰）、chalk marks（粉笔痕迹）。
She wiped the chalk dust off her hands and left the classroom.
她擦掉手上的粉笔灰，离开了教室。
grammar · medium
易错句子The teacher has many chalk in her bag.
正确表达The teacher has a lot of chalk in her bag.
chalk 表示“粉笔”这种物质时是不可数名词,不能用 many 去修饰;many 只能接可数名词复数。表示“许多粉笔”要用 much 或 a lot of,所以这里说 a lot of chalk 才正确。
grammar · medium
易错句子She wrote the sentence on the blackboard by chalk.
正确表达She wrote the sentence on the blackboard with chalk.
汉语的“用”在英语里表示使用某种工具或材料时要用介词 with;by 多用于交通方式或固定说法(如 by bus、by hand),不能引出书写工具,所以“用粉笔”是 with chalk。
grammar · medium
易错句子The teacher turned around and wrote the answer on the chalk.
正确表达The teacher turned around and wrote the answer on the chalkboard.
chalk 只指“粉笔”这种书写材料,不指“黑板”;写字用的板面应说 chalkboard 或 blackboard。把 chalkboard 截短成 chalk,句子就变成“把答案写在粉笔上”,意思错了。
一根粉笔
The teacher picked up a piece of chalk and began to write on the board.
老师拿起一根粉笔，开始在黑板上写字。
粉笔灰
Chalk dust had settled along the tray under the blackboard.
黑板下方的粉笔槽里落了一层粉笔灰。
粉笔画
The children made a colorful chalk drawing on the pavement.
孩子们在人行道上画了一幅色彩鲜艳的粉笔画。
粉笔标记
There were faint chalk marks on the wall where the shelf should go.
墙上留着淡淡的粉笔标记，标示架子该装的位置。
裁缝用划粉
She marked the hem with tailor's chalk before cutting the fabric.
裁剪布料前，她用裁缝划粉在折边处做了标记。
Choose the next layer that will help you use chalks with more confidence.
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Dictionary facts from ECDICT, WIKTIONARY.
白垩悬崖
The white chalk cliffs rise straight out of the sea.
白色的白垩悬崖笔直地矗立在海面上。