proof of title

例句：

1. 1. The seller provided a proofof title to the buyer.
   卖家向买方提供了产权证明。
2. 2. The title was not clear, so we needed to get a proofof title from the county office.
   产权不明确，所以我们需要从县办公室获取产权证明。
3. 3. The buyer requested a proof oftitle before signing the contract.
   买家在签订合同前要求提供产权证明。