There are two kinds of offer, offer

There are two kinds of offer, offer his engagement（from offer）.offer without engagement(non-firm). offer with engagement is different from offer without engagement. The latter is just an indication of price notice， while the former is a definite commitment on the part of a supplier. An offer with engagement (firm offer )is made when a seller promise to sell goods at stated price within a stated period of time, It can develop into a contractual obligation, Thus, once it is accepted by a buyer, the seller cannot revoked or amend it.

結果 (中文) 1:

有两种报价，提供他没有 engagement(non-firm) 的 engagement(from offer).offer。实盘是不同的可变更报价。后者是只是相对值的涨价通知，而前者是一个供应商作出明确承诺。实盘 （实盘） 由卖方承诺在销售商品说明价格在规定的时间内时，它可以发展成一项合同义务，因此，一旦它被接受由买方，卖方不能撤销或修改它。

結果 (中文) 3:

有两种报价，提供他的订婚（从报盘）。要约与承诺是不同的，没有约束力的要约。后者只是一个价格通知的指示，而前者是一个供应商的一部分明确的承诺。当卖方承诺在规定的价格内出售货物时，卖方承诺可以发展成一种合同义务，因此，一旦买方接受买方，卖方不能撤销或修改它。