Double over the edge before sewing.

在缝纫时先把边折过来。

Let me double over the shawl and put it round you.

让我把这披肩折起来围在你的身上。

Demand for food is expected to double over the next forty years.

粮食需求预计在接下来的四十年翻一番。

Yes, some of these websites do double over for file storage needs.

是的，这些网站有一些是翻番的文件存储需求。

He expects consumption of coal to double over the following 10 years.

他预计在未来十年，煤的消耗量将翻番。