chalk it upv. 记帐;宣布
french chalkn. 滑石粉
4.The pastel chalks with their softness and gentleness of colour gave his pictures a marvellous new lightness and an almost unexpected beauty.
彩色粉笔所具有的那种轻淡柔和的色彩赋予他的画一种新颖而奇妙的明快鲜亮,几乎是出乎意料的美。
5.Influences of water interaction on the mechanical behaviour of porous chalks have been studied.
我们研究了水对多孔白垩岩的力学性质影响。