1·It was once used to keep food in Europe.
在欧洲，它曾被用来保存食物。
2·Believe it or not, yellow was once used to mean stop.
信不信由你，黄色曾经用于表示停止。
3·Once used, you will become rotten.
一旦用了，你就会烂掉。
4·Dad bought a tool kit but never once used it.
爸爸买了一组的工具箱，但是从来都没用过。
5·For example, a computer was once used to design a brewery.
例如曾经利用一台计算机来设计一间啤酒厂。
6·Dipa ma and Hema once used their extraordinary powers in tandem to move a bus.
蒂帕嬷和西嬷曾联手用她们的神通力影响一辆公共汽车的运行。
7·The large steam-breathing machines that once used this road no longer needed it.
那个巨大使用蒸汽推动的机器，曾经使用这条路但是现在不再需要它了。
8·Once used as a holiday home by a family, the house was later transformed into a museum.
以前曾是一个家庭的度假小屋，后经改造成，小屋成了博物馆。
9·White dwarfs are stars that have burned up all of the hydrogen they once used as nuclear fuel.
而白矮星则是将其曾用作核燃料的所有氢原子都燃烧殆尽的恒星。
10·Once used exclusively by accountants, spreadsheets are widely used by nearly every profession.
一旦专门用于由会计师，电子表格被广泛使用的几乎每一个专业。