supporting document的用法和样例：
例句
- The document was validated by the bank.
银行核实了这份单据。 - A document sent to a vendor requesting goods or services.
一种提交给卖主的，关于购买货物和服务要求的单据。 - The custom officer asks him to produce the relevant document.
海关官员请他出示有关证件。 - That's a very interesting claim, but can you document it?
那项要求很有意思，可是你有证件加以证明吗？
