Phonological is the adjective for phonology. It talks about the sound system of a language, or about the study of that system — not about the physical noise in the air.

Phonological phonological is是 the adjective形容詞 for phonology對應phonology（音韻學）這個詞。It這個字 talks about講的是 the sound system of a language一個語言的聲音系統，or或者 about the study of that system研究這個系統的這門學問——not about而不是 the physical noise in the air空氣中實際發出的聲音。

A phonological rule is a pattern the language follows, like “this sound changes when it sits next to that one,” or “this cluster of sounds may end a word but may not start one.” Though actually, students often reach for phonological when they mean phonetic.

A phonological rule一個音韻規則 is是 a pattern the language follows這個語言遵守的一種模式，like像是 "this sound changes when it sits next to that one,"「這個音在某個音旁邊時會改變」，or或者 "this cluster of sounds may end a word but may not start one."「這一串音可以放在字尾但不能放在字首」。Though actually不過事實上，students學生 often reach for phonological常常會用phonological這個字 when they mean phonetic但他們真正想講的其實是phonetic。

Phonetic is about the real sound in the mouth and the air. Phonological is about which sounds the language treats as different, and how they are allowed to sit together. Two sounds can be phonetically a little different and still be phonologically “the same” in that language — English speakers do this with the p in pin and spin.

Phonetic phonetic is about講的是 the real sound實際的聲音 in the mouth and the air在嘴巴裡、在空氣中的樣子。Phonological phonological is about講的是 which sounds the language treats as different這個語言把哪些聲音當成不同的音，and還有 how they are allowed to sit together這些音可以怎麼排在一起。Two sounds兩個音 can be phonetically a little different在語音上可能有點不同，and still be但仍然可以 phonologically "the same"在音韻上算是「一樣的」 in that language在那個語言裡——English speakers do this英語使用者就是這樣 with the p in pin and spin對待pin和spin裡的那個p。

This is a formal, academic word. You will meet it in linguistics, speech therapy, and sometimes in serious language-teaching writing, not in the street.

This這個字 is是 a formal, academic word一個正式、學術性的詞。You will meet it你會遇到它 in linguistics, speech therapy,在語言學、語言治療，and sometimes in serious language-teaching writing還有一些嚴肅的語言教學文章裡，not in the street而不是在日常街頭對話裡。