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。The problem was twofold.这个问题分两个部分。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....
Watercolour still seems somehow to be the poor relation of oil painting.水彩画似乎仍比油画略逊一筹。The centre of attraction was Pierre Auguste Renoir's oil painting.最吸引人注意的是皮埃尔·奥古斯特·雷诺阿的油画。Oil painting is to be appreciated at a ...