ViTalk英语口语头条号原创文章，未经允许请勿转载、二次修改或截取片段盗用，违权必究。最近有的同学在使用微信的英文模式的时候，发现“发票”被翻译成拼音Fapiao，很不理解为什么不用invoice表达呢？现在我们就来看一看Fapiao里面的奥秘吧！
An invoice， bill or tab is a commercial document issued by a seller to a buyer， relating to a sale transaction and indicating the products，
它在词典中的的释义是:a list of goods that have been supplied or work that has been done， showing how much you owe for them。
Google对“invoice”的定义是:a list of goods sent or services provided， with a statement of the sum due for these;I'm going to make out a Fapiao for you.
PI是形式发票，PI的全称也就是Proforma Invoice，用于估价发票，试算发票，备考货单。PI形式发票不是一种正式发票，不能用于托收和议付，它所列的单价等，也仅仅是进口商根据当时情况所作的估计，让客户看清楚自己锁采购的物品信息，这个对双方是没有最终的约束力的，所以这个形式发票只是一种估价单。
1.商业发票Commercial invoice 2.形式发票 Proforma invoice 3.收讫发票 Received invoice 4.证实发票 Certificate invoice 5.详细发票 Detailed invoice 6.中性发票 Neutral i
