A small, sudden movement of a muscle that a person cannot stop — most often in the face, like an eye blinking hard again and again, or a corner of the mouth pulling. The key idea is 'not on purpose': a tic happens to you, you do not decide it.

A small, sudden movement of a muscle一種肌肉突然、短暫的動作 that a person cannot stop一個人沒辦法控制它 — most often in the face最常出現在臉部，like an eye blinking hard again and again像是眼睛用力一直眨，or a corner of the mouth pulling或嘴角一直抽動。The key idea關鍵的概念 is 'not on purpose'是「不是故意的」：a tic抽動 happens to you是發生在你身上的，you你 do not decide it並不是你自己決定的。

Tics often get stronger when someone is tired or nervous. Some people have them for a short time only; for others they are part of a medical condition, and doctors talk about vocal tics too, where the sudden thing is a sound rather than a movement.

Tics抽動 often get stronger常常會加劇 when someone is tired or nervous當一個人很累或緊張的時候。Some people有些人 have them for a short time only只會抽動一段短時間；for others對某些人來說 they are part of a medical condition則是某種病症的一部分，and doctors talk about vocal tics too而醫生也會提到聲音型的抽動，where the sudden thing is a sound rather than a movement那種突然發出的是聲音而不是動作。

English also uses 'tic' more loosely for a habit someone repeats without noticing — a speaker who says 'you know' every ten seconds has a verbal tic, a writer who always starts with 'So,' has a stylistic tic. That looser use is common in writing about people's style, and it is usually gentle, not cruel — though calling someone's real medical tic a 'habit' would be unkind, because they cannot choose to stop.

English英文 also uses 'tic' more loosely也會比較鬆散地用 tic 這個字 for a habit someone repeats without noticing來指一個人不自覺一直重複的習慣——a speaker who says 'you know' every ten seconds一個每十秒就說一次「你知道的」的人 has a verbal tic就有一種口頭禪式的小動作，a writer who always starts with 'So,'一個每次開頭都寫「So,」的作者 has a stylistic tic就有一種寫作上的慣性小動作。That looser use這種比較鬆散的用法 is common in writing about people's style在描寫一個人風格的文章裡很常見，and it而且 is usually gentle, not cruel通常語氣溫和、不帶惡意——though calling someone's real medical tic a 'habit'不過如果把某人真正的醫學抽動叫做「習慣」 would be unkind那就不太厚道了，because they因為他們 cannot choose to stop沒辦法選擇不做。