Ma helped him stretch white canvas over them.

妈妈帮他在上面铺上白色帆布。

Some had tins of white emulsion paint outside, and I walked past an open door revealing a woman in baggy jeans stretching a canvas over a huge wood frame.

有些外面放着几罐白色乳胶漆，我走过一扇敞开的门， 里面是一个穿着宽松牛仔裤的女人， 她正在一个巨大的木框上伸展帆布。