chalk
复数形式
chalks
1
粉笔, 粉笔棒
a white or colored stick similar to chalk that is used for drawing or writing
Chalk is a soft, white or colored substance made from calcium carbonate, commonly used for writing or drawing on surfaces like blackboards or sidewalks. It comes in stick form and can be easily erased or washed away, making it ideal for temporary markings.
2
甲基苯丙胺, 美沙酮
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
3
粉笔, 粉笔白
a pure flat white with little reflectance
4
粉笔, 白垩
a soft whitish calcite
5
白垩, 白垩岩
a group of soft, white rock layers made mainly from the remains of tiny sea animals, often found in hills, cliffs, or underground
- The cliffs are made of thick chalk deposits.
悬崖是由厚厚的白垩沉积物构成的。
- Geologists studied the chalk layers in the hill.
地质学家研究了山上的白垩层。
- Fossils were found deep in the chalk.
化石是在白垩深处被发现的。
- The chalk in this area formed millions of years ago.
这个地区的白垩形成于数百万年前。
- Rain slowly wears down the chalk over time.
雨水会慢慢侵蚀白垩随着时间的推移。