| 单词 | chalk |
| 释义 | chalk (once / 654 pages) 1nv 2n 3n Chalk is a very soft kind of rock or limestone. While chalk is made of shells and the skeletons of sea creatures, it's usually found above sea level in pits or quarries. Chalk is made of the element calcium carbonite, and it has agricultural uses, as well as showing up (in tiny amounts) in both toothpaste and antacids. The kind of chalk that you use for writing on a blackboard or decorating the sidewalk was originally made from calcium carbonite, but modern writing chalk is more often made of gypsum, a related form of calcium. Chalk comes from the Latin calx, "limestone," with the Greek root khalix, "small pebble." WORD FAMILYchalk: chalked, chalking, chalks, chalky+/chalky: chalkily USAGE EXAMPLESUse markers, crayons, paint, pencils, chalk, construction paper cutouts or whatever else strikes your fancy. Washington Post(Nov 30, 2016) Should I just chalk up her behavior to hormones? Washington Post(Nov 22, 2016) —A Baltimore nonprofit called Thread organized a “Love Notes to Baltimore” campaign where residents wrote uplifting messages in chalk on streets. Seattle Times(Nov 30, 2016) 1 1n a soft whitish calcite Hyper calcite a common mineral consisting of crystallized calcium carbonate; a major constituent of limestone 2n a piece of calcite or a similar substance, usually in the shape of a crayon, that is used to write or draw on blackboards or other flat surfaces Hypo|Hyper drawing chalk colored chalks used by artists tailor's chalkchalk used by tailors to make temporary marks on cloth writing implement an implement that is used to write 3v write, draw, or trace with chalk 2Hyper draw represent by making a drawing of, as with a pencil, chalk, etc. on a surface n a pure flat white with little reflectance 3Hyper white, whiteness the quality or state of the achromatic color of greatest lightness (bearing the least resemblance to black) n 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 Hyper controlled substance a drug or chemical substance whose possession and use are controlled by law |
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