Offer and Counter-offer:An offer is a proposal made by sellers to buyers in order to enter into a contract.In other words,it refers to trading terms put forward by offerees,on which the offerors are willing to conclude business with the offerees.There are two kinds of offers,one is firm offer,the other,non-firm offer.A reply to an offer which purports to be an acceptance but contains additions,limitations or other modifications is a rejection of the offer and constitutes a counter-offer.
要约与反要约:要约是卖方为了达成合约向买方提出的建议.换句话说,它是指要约人提出的要约人愿意同被要约人达成交易的交易条款.要约有两种类型.一种是要约,另一种是要约邀请.答复一个要约表示接受但是附有补充、限制或其他修订均是对原要约的拒绝,并构成一个反要约.
顺便提一下,In other words,it refers to trading terms put forward by offerees中的offerees应为offerors