zài / qiāndìng / zhèngshì / hétóng / zhīqián / gōngyìngshāng / xiān / jìlái / yí / fèn / xíng shì fā piào / fāngbiàn / wǒmen / héduì / jiàgé / hé / shùliàng

在签订正式合同之前，供应商先寄来一份形式发票，方便我们核对价格和数量。

Before signing the formal contract, the supplier first sent us a pro forma invoice so that we could check the prices and quantities.