在题意翻译的第二行,对矩形的描述的第二个条件写的是 c−0.5≤x≤d+0.5c-0.5\leq x\leq d+0.5c−0.5≤x≤d+0.5 应改为 c−0.5≤y≤d+0.5c-0.5\leq y\leq d+0.5c−0.5≤y≤d+0.5