Today's tip is on the pronunciation of the letter " t ". （" t "的發音）今天的小貼士是關于字母 " t " 的發音。
Of course the letter " t " is usually pounced " t ". 當然字母 " t " 通常發成 " t "。（編注:原字幕此處有錯誤）
But you may have noticed that in fluent speech, native speakers sometimes pronounced the " t " as " d ".
但是你可能注意到在流利的口語中，以英語為母語的人有時就會把 " t " 發成 " d "。
That happens when the " t " comes between two voiced sounds. 那通常是 " t " 出現在兩個發音的中間。
Do you know what sounds in English are voiced? 你知道在英語里什么音是發音的？（編注:原字幕此處有錯誤）
Well, there're 15 voiced consonant sounds in English. b, d, g, m, n, ɡ, z, δ, l, r, dз, з, j, w.
在英語中有十五個發音的輔音。
Also, all vowel and diphthong sounds in English are voiced. 同樣地，所有英語元音和雙元音都是發聲的。
So let's look at some examples of words in which the " t " may be pronounced " d ".
所以我們來看下單詞中有 " t " 發成 " d " 的例子。

1. "matter".
"matter" is often pronounced "mader" as in "What's the matter?"
"matter" 經常會發成 "madder"如在 "What's the matter?"
2. "atom".
"atom" is often pronounced "adom" as in "The first atom bomb was dropped on Hiroshima."
"atom"通常會發成 "adom"如在"The first atom bomb was dropped on Hiroshima."
3. "twenty".
"twenty" is often pronounced "twendi" as in "That will be twenty dollars, please."
"twenty" 通常會發成"twendi" 如在"That will be twenty dollars, please."
4. "little".
"little" is often pronounced "liddle" as in "He got a little angry."
"little" 通常會發成"liddle" 如在"He got a little angry."
5. "city".
"city" is often pronounced "cidi" as in "Did you grow up in the city or the country?"
"city"通常會發成"cidi"如在"Did you grow up in the city or the country?"
6. "butter".
"butter" is often pronounced "buder" as in "Pass the butter, please."
"butter"通常會發成"buder"如在"Pass the butter, please."

When people speak slowly or emphatically, however, they usually pronounce the " t " like " t ", not like " d ".
當人們慢慢地或強調地說時， 他們通常會把" t " 發成" t "，而不是" d "。
Also, a " t " does not sound like " d " when it comes before a stressed vowel as in "return".
而且是，" t " 不會發成 " d " 當它出現在如 "return" 中一個重音的元音前面。

This has been today's daily tip on learning English. 這就是今天的關于學習英語的小貼士。