chalks

a stick of chalk used for writing or drawing on a blackboard

1. 1.

   A soft, white, powdery limestone (calcium carbonate, CaCO3).

   一种柔软、白色、粉状的石灰石(碳酸钙,CaCO3)

2. 2.

   a soft whitish calcite

   一种柔软的白色方解石

3. 3.

   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

4. 4.

   a pure flat white with little reflectance

   一种反射率极低的纯平白色

5. 5.

   Tailor's chalk.

   裁缝用粉笔

6. 6.

   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

7. 7.

   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).

   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)

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

In use

Connections

Learner notes