求翻译：首先非常感谢你的回复，我们所报的价格是根据我们的生产成本计算得来的，所以我只能说我们所报的价格是真实的价格，至于其他供应商的价格低于我们20%的价格，我真的不知道他们怎么可以做到，我只能说我们做不到。是什么意思？

First of all, thank you very much for your reply, we quoted prices are based on our cost of production calculated, so I can only say that the real price is the price we quoted, as for other vendor's price is lower than our 20% price, I really don't know what they can do it, I can only say that we do it.