trace作动词的意思是（通过调查）找到、追溯、追踪，沿（特定路径）走、画、勾画出轮廓，作名词的意思是痕迹、踏出来的小路、痕迹、语迹、跟踪，微量、丝毫、描记线、交线、缰绳，它的发音就是【tre?s】。

explain的常用短语是：用作动词(v.)explain away (v.+adv.)通过解释消除… give a satisfactory reason for; get rid of by explanationexplain sth ⇔ awayI didn't believe her at first, but she managed to explain away my doubts.起初我不相信她,可是她的解释消除了我的怀疑。She explained away the child's fears.她通过解释消除了孩子的恐惧。He tried to explain away his lateness, but we didn't accept his excuse.他竭力为自己迟到辩解,但是,我们不相信他的托词。You will find it difficult to explain away your use of such offensive language.你将会发现你很难为说过这种无理的话辩解。He thought of a reason to explain away his failure.他想出一个理由为他的失败辩解。John explained away his unfinished task by showing his boss a certificate for sick leave.约翰交给上司一个病假条,以此解释他为什么没完成任务。The criminal tried to explain away the false signature, but it was clear that he was guilty.罪犯试图为伪造签名一事开脱自己,但他显然是有罪的。The murder suspect couldn't explain away his fingerprints at the scene.这个杀人嫌疑犯解释不清为什么在杀人现场会留有他的指纹。Such a conclusive evidence is hard to be explained away.如此确凿的证据是很难巧辩的。explain的意思是v.说明；解释。explain【近义词】define。

explain的第三人称单数是：explains。explain的详尽释义是v.(动词)说明，解释，阐明说明...的理由替...辩解吐露，讲出，明说揭开。explain的例句是用作动词(v.)She explained her conduct to her boss.她向老板说明了自己那种表现的原因。

explain的现在分词是：explaining。explain的详尽释义是v.(动词)说明，解释，阐明说明...的理由替...辩解吐露，讲出，明说揭开。explain的读音是英[ɪk'spleɪn]；美[ɪk'spleɪn]。

explain的过去式是：explained。explain的详尽释义是v.(动词)说明，解释，阐明说明...的理由替...辩解吐露，讲出，明说揭开。explain【近义词】define。

propose的意思是：v.打算；计划；向 ... 提议；求婚；提名。propose的词语用法是v.(动词)propose的基本意思是“提议,建议”,多指在讨论或争辩中提出明确的意见或建议,强调要求对方予以考虑或同意。引申可表示“打算,计划(做某事)”。可用作及物动词,也可用作不及物动词。用作及物动词时,可接名词、代词、动名词、动词不定式或从句作宾语。后接从句时,从句要用虚拟语气。propose的读音是英[pr?'p??z]；美[pr?'po?z]。

nonono

nonono

1.It could make extra training and instruction affordable.(它使人们负担得起额外的培训和指导费用。)

1、名词性从句，即指性质相当于名词的从句，它包括主语从句、宾语从句、表语从句和同位语从句。从高考的考查的实际情况来看，名词性从句考得最多的是宾语从句，其次是主语从句，再次是表语从句，而同位语从句则很少考查。2、连接词 that 引导名词性从句时，只起连接作用，没有任何意思，也不充当句子成分，在宾语从句中可省略，但引导其他名词性从句时通常不省略。如：