The average American uses between half a roll to just over one roll a week.

美国人平均每周使用半卷到刚过一卷的卫生纸。

Hermione was writing a very long letter; she had already filled half a roll of parchment, which was dangling from the edge of the table.

赫敏正写一封非常长的信，已经写满半卷羊皮纸文稿，那半卷从桌子的边缘悬挂下来。