黑色硬度

channel black───[橡胶]槽法炭黑

bone black───[涂料]骨黑

carbon black───[化工]炭黑；碳黑

gas black───气黑

hard luck───厄运；倒霉（等于toughluck）

hard tack───压缩饼干

hardback───n.精装本；[图情]硬封面的书；adj.精装的；硬封面的

Results: The hardness of black plaster is positively associated with softening point and viscosity, while it is negatively correlated with penetration.───结果：黑膏药的软化点、黏度与软硬度呈正相关，而针入度与软硬度呈负相关。

There are natural sceneries as well as artificial ones, both rich in the beauty of movement and tranquility, softness and hardness, black and white.───就其山水而言，包括自然山水与人工山水，二者均富于动静、软硬、黑白之美。

Black colour, its hardness is higher than that of WA, its toughness is a bit lower.───黑色，有光泽，硬度比白刚玉高，韧性较低。