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　　Welcome to Daily Tips on Learning English. Today’s tip is on the pronunciation of the letter “t”.

　　Of course the letter “t” is usually pounced “t”. But you may have noticed that in fluent speech, native speakers sometimes pronounced the “t” as “d”. That happens when the “t” comes between two voiced sounds（浊音）.

　　一般情况下，“t”发“t”的音。但你也许能注意得到，外国人在说的很快时，会将't'发成'd'的音。一般't'的两边都是发浊音的情况下，会浊化为'd'。

　　Do you know what sounds in English are voiced? Well, there’re 15 voiced consonant sounds(浊辅音)in English. /b/, /d/,/g/,/m/, /n/, /ng//v/,/z/, /δ/,/l/, /r/, /d?/,/?/,/y/, /w/.

　　你知道什么音是浊音吗？英语中浊辅音有/b/, /d/,/g/,/m/, /n/, /ng//v/,/z/, /δ/,/l/, /r/, /d?/,/?/,/y/, /w/.

　　Also, all vowel and diphthong sounds in English are voiced. So let’s look at some examples of words in which the “t” may be pronounced “d”.

　　元音、双元音都是浊音，我们来看看一些例子。

　　No.1 “matter”. “matter” is often pronounced “mader” as in “What’s the matter?”

　　No.2 “atom”. “atom” is often pronounced “adom” as in “The first atom bomb was dropped on Hiroshima.”（第一颗原子弹落在了广岛。）

　　No.3 “twenty”. “twenty” is often pronounced “twendi” as in “That will be twenty dollars, please.” （请给我二十美元。）

　　No.4 “little”. “little” is often pronounced “liddle” as in “He got a little angry.”（他有些生气。）

　　No.5 “city”. “city” is often pronounced “cidi” as in “Did you grow up in the city or the country?”（你在城市还是农村长大？）

　　No.6 “butter”. “butter” is often pronounced “buder” as in “Pass the butter, please.”（请把黄油递过来 。）

　　When people speak slowly or emphatically, however, they usually pronounce the “t” like “t”, not like “d”.

　　但当人们说的很慢或表强调时，通常发的更像't' 而不是'd'

　　Also, a “t” does not sound like “d” when it comes before astressed vowel（重读元音）as in “return”.

　　当't'后有一个重读的元音时，‘t’ 发音也不像'd'。

　　This has been today’s daily tip on learning English. Tune in tomorrow for another tip.

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