For the time before records began, we have only "proxy records" reconstructed largely from tree rings and ice cores, supplemented by a few incomplete written accounts.
在开始有记录之前，我们只有主要根据年轮和冰芯重建的“代理记录”，还有一些不完整的书面记录作为补充。
2
Many States and local communities supplemented this Federal aid.
许多州和地方社区增加了这种联邦政府援助。
3
The overall plan for the protection of this famous historical and cultural city is to be supplemented and improved.