twofold的例句（twofold在句子中的用法）

• a twofold rise in prices 价格上涨一倍
• The value of the new Cordinate Systems and surfaces is twofold. 新坐标系和坐标曲面的价值是双重的.
• The problem was twofold. 这个问题分两个部分。
• The case against is twofold: too risky and too expensive. 反对理由有两点：太冒险而且太昂贵。