public interface J_Shape { public abstract double Area();不满抱怨的话叫//计算并返回N边形的面积 public 几何画板官网abstract double Perimeter();//计算并返回N边形的面积}public class J_Point{ publi
turnaround中文翻译turn around的中文意思是“改观，好转；旋转；船只在港内的转向”。例句：1、NC Dresr on Which the Dressing Tool Can Turn Around the Arc Center.修整工具能绕刃口圆弧圆心转动的数控砂轮修整器。2、Throughout the gig, they had to turn around contin
