“双重的”的英语？

新坐标系和坐标曲面的价值是双重的.The value of the new Cordinate Systems and surfaces is twofold.他们的目标是双重的: 通货膨胀与失业.Their targets were twofold: inflation and unemployment.这种多样性是由于双重的气候影响而形成的.This versatility comes from a dual weather inf...