五年级英语下册单元知识点20221.once一次single单一的singleness单一;单身single-handed独手的，只用一只手的2.pair双，对double两倍的double-decker双层床;双层电车double-chinned双下巴的3.quarter四分之一;一刻钟;两角五分钱(美国、加拿大的)threequarters四分之三4.dozen十二，一打twodozenof两打dozensof好几打，很多的indozens成打的dozenth=twelfth第十二abakers(/printers/long)dozen十三个5.score二十threescoreandten七十twoscoreof四十个scoresof大批的inscores大量地，大批地6.fortnight十四日，两星期fortnightly两星期一次的;双周刊7.decade十年century百年，世纪bicentenary二百周年(的)octocentenary八百周年(的)millenary/millennium千年，千年英语知识点五年级字母"t"的发音Today’stipisonthepronunciationoftheletter"t".("t"的发音)今天的小贴士是关于字母"t"的发音。Ofcoursetheletter"t"isusuallypounced"t".当然字母"t"通常发成"t"。(编注：原字幕此处有错误)Butyoumayhavenoticedthatinfluentspeech,nativespeakerssometimespronouncedthe"t"as"d".但是你可能注意到在流利的口语中，以英语为母语的人有时就会把"t"发成"d"。Thathappenswhenthe"t"comesbetweentwovoicedsounds.那通常是"t"出现在两个发音的中间。DoyouknowwhatsoundsinEnglisharevoiced?你知道在英语里什么音是发音的?(编注：原字幕此处有错误)Well,there’re15voicedconsonantsoundsinEnglish.b,d,g,m,n,ɡ,z,δ,l,r,dз,з,j,w.在英语中有十五个发音的辅音。Also,allvowelanddiphthongsoundsinEnglisharevoiced.同样地，所有英语元音和双元音都是发声的。Solet’slookatsomeexamplesofwordsinwhichthe"t"maybepronounced"d".所以我们来看下单词中有"t"发成"d"的例子。1."matter"."matter"isoftenpronounced"mader"asin“What’sthematter?”"matter"经常会发成"madder"如在“What’sthematter?”2."atom"."atom"isoftenpronounced"adom"asin“ThefirstatombombwasdroppedonHiroshima.”"atom"通常会发成"adom"如在“ThefirstatombombwasdroppedonHiroshima.”3."twenty"."twenty"isoftenpronounced"twendi"asin“Thatwillbetwentydollars,please.”"twenty"通常会发成"twendi"如在“Thatwillbetwentydollars,please.”4."little"."little"isoftenpronounced"liddle"asin“Hegotalittleangry.”"little"通常会发成"liddle"如在“Hegotalittleangry.”5."city"."city"isoftenpronounced"cidi"asin“Didyougrowupinthecityorthecountry?”"city"通常会发成"cidi"如在“Didyougrowupinthecityorthecountry?”6."butter"."butter"isoftenpronounced"buder"asin“Passthebutter,please.”"butter"通常会发成"buder"如在“Passthebutter,please.”Whenpeoplespeakslowlyoremphatically,however,theyusuallypronouncethe"t"like"t",notlike"d".当人们慢慢地或强调地说时，他们通常会把"t"发成"t"，而不是"d"。Also,a"t"