如下图所示的阴影部分是一个长方形,四周是四个正方形,如果这四个正方形的周长的和是240厘米、面积的和是1000平方厘米,那么阴影部分的面积是多少平方厘米?
The doctor is skilled at treating heart trouble and never accepts any gift from his patients,so he has a very good_____.