確 assurance 破 rend 石 stone 研 polish 砲 cannon 砂 sand 砕 smash 磁 magnet 硬 stiff 磨 grind 礎 cornerstone 碧 blue 磯 seashore 碑 tombstone 硝 nitrate 硫 sulphur 礁 reef 碁 Go 碩 large