原级：restorer
1. This requires the restorers use the original materials of lime and earth and not cement.
2. There is also the perpetual worry of too many books waiting to be restored and not enough qualified restorers.
3. Yet despite the huge number of cultural relics that need restoration work, there are few qualified restorers and conservation technicians available.
4. It is too badly damaged, and past restorers have robbed it of vitality.
5. Its wide, open arches also provide scant shade for the restorers from blistering hot Tuscan summers.