n. (c./u.)名詞 (可數/不可數)成人;成年者In some countries you become an adult at 18, in others 20 or 21
adj.形容詞成人的;成熟的The college offers adult education classes to people who work during the day
n. (c./u.)名詞 (可數/不可數)成年動物The adult butterfly lays its eggs on milkweed plants.
n. (c./u.)名詞 (可數/不可數)成熟植物The adult plant is ready to be harvested.
adj.形容詞成人內容The film contains adult content and is not suitable for children.
n. (c./u.)名詞 (可數/不可數)成人教育Adult education programs offer opportunities for lifelong learning.