eighteenKK [eˋtin] /eɪˈtin/形容詞1十八的、十八個There were eighteen students waiting outside the classroom.教室外面有十八個學生在等。2十八歲的She started working here when she was eighteen years old.她十八歲的時候就開始在這裡工作了。名詞1十八Add eighteen to the total and write down the answer.把十八加進總數,然後寫下答案。2十八歲You can vote in this country at eighteen.在這個國家,滿十八歲就可以投票。