Hardness than corundum, abrasive easily broken, sharp edges and corners, good cutting, grinding heat and small.
硬度高于棕刚玉，磨粒易破碎，棱角锋利，切削性能好，磨削热量小等。
Insist Aoyama do not relax, rooted in the broken rock, known grinding million hit is also tough, Seoul, the four corners of the world wind.
咬定青山不放松，立根原在破岩中，知磨万击还坚韧，任尔东西南北风。——郑板桥。
From the urban point of view, the block is broken into several slices which have been split in order to multiply the free corners.
从城市的角度来看，这个区块被分成几片，为了分成多处自由角落，它被这样分割开来。
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