grind词根是

grind词根的派生词是grinding，grinding中文意思是adj. （状态）难熬的，折磨人的刺耳的，吱吱嘎嘎响的

This picture echoes an old Chinese poem: Sharp edge of a sword comes out from grinding， and plum blossom's fragrance comes from the bitter cold.这张照片和一首中国古诗产生了共鸣：宝剑锋从磨砺出，梅花香自苦寒来。