中文：
invitation to treat 有“邀請(qǐng)投標(biāo)人做交易 ”、“磋商的邀請(qǐng) ”、“要約邀請(qǐng)”以及“請(qǐng)人出價(jià)”的意思.
Invitation to treat：要約邀請(qǐng),不是一個(gè)有效的要約.例如,登載于報(bào)刊的一般廣告、郵寄的招標(biāo)、拍賣 通知,以及寄送價(jià)目表和商品目錄等,均不屬要約.
offer
有“提出,提供”、“報(bào)盤報(bào)價(jià) ”以及“要約”的意思.
offer：要約是一方當(dāng)事人向另一方當(dāng)事人提出訂立合同的條件.希望對(duì)方能完全接受此條件的意思表示.發(fā)出要約的一方稱為要約人,受領(lǐng)要約的一方稱為受要約人.
要約與要約邀請(qǐng)的區(qū)別：
a.要約邀請(qǐng)是指一方邀請(qǐng)對(duì)方向自己發(fā)出要約,而要約是一方向他方發(fā)出訂立合同的意思表示；
b.要約繳 不是一種意思表示,而是一種事實(shí)行為.要約是希望他人和自己訂立合同的意思表示,是法律行為；
c.要約邀請(qǐng)只是引誘他人向自己發(fā)出要約,在發(fā)出邀請(qǐng)要約邀請(qǐng)人撤回其中邀請(qǐng),只要未給善意相對(duì)人造成信賴?yán)娴膿p失,邀請(qǐng)人并不承擔(dān)法律責(zé)任,以下四個(gè)法律文件為要約請(qǐng)：寄送的價(jià)目表、拍賣公告、招標(biāo)公告、招股說(shuō)明書.
eg：
Care must be taken, however, in distinguishing between an offer and an invitation to treat.
要注意的是,無(wú)論如何,應(yīng)當(dāng)區(qū)分出協(xié)議中的要約和要約邀請(qǐng).
以下英文僅供參考：
nvitation to treat
There are "invited bidders to do business," "consultation invitation", "solicitation" and "asked people to bid" means.
Invitation to treat: an invitation, not a valid offer. For example, published in newspapers of general advertising, mailing tender, auction notices, and send price lists and catalogs, are not an offer.
offer
Have "made available", "offer price" and "offer" means.
offer: an offer is made a party to the other party to contract conditions. Hope someone can fully accept that the meaning of this condition. An offer of a party called the offeror, the party called Upon receiving the offer by the offeror.
The difference between an offer and an invitation:
a. is an invitation to a party invitation to make an offer to the direction of their own, and offer a direction of the other party's intention to issue a contract;
b. offer to pay is not an intention, but a fact that behavior. Offer hope to others and their own meaning of a contract that is a legal action;
c. solicitation is an offer to lure others to their own, in the solicitation of an offer to withdraw an invitation to invite them, as long as good faith is not relative to the losses caused by reliance interest, invite people do not bear legal responsibility, the following four legal documents as an offer, please : send the price list, auction notice, tender notice, the prospectus.
eg:
Care must be taken, however, in distinguishing between an offer and an invitation to treat.
It should be noted, however, should distinguish between the Agreement and the solicitation of an offer.
附 另外一簡(jiǎn)單回答：
“Invitation to treat” does not have binding force to the person who is giving it to another person,. E.g. advertisement, price displayed on the shop-window. This is an “invitation” to another person to make an offer to contract. A buyer may make an offer; the seller may reject that offer.
On the contrary, an “offer” must be clearly made and direct approach to another party to contract; it is an expression of willingness to negotiate. Thus, the person make an “offer” is intending to be bound.
These two concepts not only have been applied in common law, but also in German civil law system. I hope my explanation can really help you.
中文來(lái)說(shuō),“Invitation to treat”是要約邀請(qǐng),是希望他人向自己發(fā)出要約的意思表示.如寄送的價(jià)目表、拍賣公告、招標(biāo)公告、招股說(shuō)明書、商業(yè)廣告等為要約邀請(qǐng).
而“offer”則是要約,與承諾相對(duì)應(yīng),依合同法第十四條的規(guī)定,要約是希望和他人訂立合同的意思表示.其構(gòu)成要件主要有：內(nèi)容具體確定；表明經(jīng)受要約人承諾,要約人即受該意思表示約束.
二者的區(qū)別明顯：其一,效力不同.要約對(duì)要約人具有約束力,而要約邀請(qǐng)則無(wú)；其二,要約以訂立合同為直接目的,受要約人承諾送達(dá),合同即告成立.要約邀請(qǐng),則不是以訂立合同為直接目的,它只是喚起別人向自己作出要約表示或使自己能向別人發(fā)出要約；其三,要約必須包含能使合同得以成立的必要條款,要約邀請(qǐng)則不是；其四,要約一般是針對(duì)特定的對(duì)象進(jìn)行,而要約邀請(qǐng)的對(duì)象則一般是不特定的大眾對(duì)象.