This story—which happened before I was born—reminds me how e

This story—which happened before I was born—reminds me how extraordinary my mother was,and is,as
Later,when my mother is in the bathroom,I go into her kitchen and turn over the breadboards.Sure enough,on the back of the smallest one,are some penciled marks I recognize as mathematics.Those symbols have travelled unaffected through fifty years,rooted in the soil of a cheap wooden breadboard,invisible (看不到的) exhibits at every meal.求翻译