为了从供应商那招徕报价，最佳价格采购过程取决于招标邀请书，也被叫做投标邀请函，投标邀请书或密封投标。

To solicit offers from providers, the best-price purchase process relies on an Invitation to Bid (ITB), also known as Invitation to tender (ITT), Invitation for Bids (IFB), or Sealed Bids.

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除了一些小改动之外，《建议书邀请函》没有任何变化，这确保了波音成为唯一的投标人。

Apart from some minor tweaks, nothing changed, ensuring that Boeing would be left as the sole bidder.

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