中文：

　　invitationtotreat有“邀请投标人做交易”、“磋商的邀请”、“要约邀请”以及“请人出价”的意思.

　　Invitationtotreat：要约邀请,不是一个有效的要约.例如,登载于报刊的一般广告、邮寄的招标、拍卖通知,以及寄送价目表和商品目录等,均不属要约.

　　offer

　　有“提出,提供”、“报盘报价”以及“要约”的意思.

　　offer：要约是一方当事人向另一方当事人提出订立合同的条件.希望对方能完全接受此条件的意思表示.发出要约的一方称为要约人,受领要约的一方称为受要约人.

　　要约与要约邀请的区别：

　　a.要约邀请是指一方邀请对方向自己发出要约,而要约是一方向他方发出订立合同的意思表示；

　　b.要约缴不是一种意思表示,而是一种事实行为.要约是希望他人和自己订立合同的意思表示,是法律行为；

　　c.要约邀请只是引诱他人向自己发出要约,在发出邀请要约邀请人撤回其中邀请,只要未给善意相对人造成信赖利益的损失,邀请人并不承担法律责任,以下四个法律文件为要约请：寄送的价目表、拍卖公告、招标公告、招股说明书.

　　eg：

　　Caremustbetaken,however,indistinguishingbetweenanofferandaninvitationtotreat.

　　要注意的是,无论如何,应当区分出协议中的要约和要约邀请.

　　以下英文仅供参考：

　　nvitationtotreat

　　Thereare"invitedbidderstodobusiness,""consultationinvitation","solicitation"and"askedpeopletobid"means.

　　Invitationtotreat:aninvitation,notavalidoffer.Forexample,publishedinnewspapersofgeneraladvertising,mailingtender,auctionnotices,andsendpricelistsandcatalogs,arenotanoffer.

　　offer

　　Have"madeavailable","offerprice"and"offer"means.

　　offer:anofferismadeapartytotheotherpartytocontractconditions.Hopesomeonecanfullyacceptthatthemeaningofthiscondition.Anofferofapartycalledtheofferor,thepartycalledUponreceivingtheofferbytheofferor.

　　Thedifferencebetweenanofferandaninvitation:

　　a.isaninvitationtoapartyinvitationtomakeanoffertothedirectionoftheirown,andofferadirectionoftheotherparty'sintentiontoissueacontract;

　　b.offertopayisnotanintention,butafactthatbehavior.Offerhopetoothersandtheirownmeaningofacontractthatisalegalaction;

　　c.solicitationisanoffertolureotherstotheirown,inthesolicitationofanoffertowithdrawaninvitationtoinvitethem,aslongasgoodfaithisnotrelativetothelossescausedbyrelianceinterest,invitepeopledonotbearlegalresponsibility,thefollowingfourlegaldocumentsasanoffer,please:sendthepricelist,auctionnotice,tendernotice,theprospectus.

　　eg:

　　Caremustbetaken,however,indistinguishingbetweenanofferandaninvitationtotreat.

　　Itshouldbenoted,however,shoulddistinguishbetweentheAgreementandthesolicitationofanoffer.

　　附另外一简单回答：

　　“Invitationtotreat”doesnothavebindingforcetothepersonwhoisgivingittoanotherperson,.E.g.advertisement,pricedisplayedontheshop-window.Thisisan“invitation”toanotherpersontomakeanoffertocontract.Abuyermaymakeanoffer;thesellermayrejectthatoffer.

　　Onthecontrary,an“offer”mustbeclearlymadeanddirectapproachtoanotherpartytocontract;itisanexpressionofwillingnesstonegotiate.Thus,thepersonmakean“offer”isintendingtobebound.

　　Thesetwoconceptsnotonlyhavebeenappliedincommonlaw,butalsoinGermancivillawsystem.Ihopemyexplanationcanreallyhelpyou.

　　中文来说,“Invitationtotreat”是要约邀请,是希望他人向自己发出要约的意思表示.如寄送的价目表、拍卖公告、招标公告、招股说明书、商业广告等为要约邀请.

　　而“offer”则是要约,与承诺相对应,依合同法第十四条的规定,要约是希望和他人订立合同的意思表示.其构成要件主要有：内容具体确定；表明经受要约人承诺,要约人即受该意思表示约束.

　　二者的区别明显：其一,效力不同.要约对要约人具有约束力,而要约邀请则无；其二,要约以订立合同为直接目的,受要约人承诺送达,合同即告成立.要约邀请,则不