An adolescent is a young person in that in-between time, usually about 12 to 18: not a little child, not quite a grown adult. You can also use it as an adjective: adolescent behaviour, an adolescent boy.

An adolescentadolescent is a young person in that in-between time, usually about 12 to 18指的是處於那段過渡期的年輕人，大概是12到18歲 not a little child, not quite a grown adult不是小小孩，但也還不算完全的成年人。 You can also use it as an adjective也可以當形容詞用 adolescent behaviour, an adolescent boy例如adolescent behaviour（青春期的行為）、an adolescent boy（一個青春期的男孩）。

It is more formal than teenager, and a bit more ‘from a textbook or a clinic.’ Teenager points to the -teen numbers (thirteen to nineteen); adolescent points to the growing-up process, so a very young twelve-year-old might still be called an adolescent. In casual talk, teenager is what people say.

It is more formal than teenager比teenager正式 and a bit more 'from a textbook or a clinic.'也比較像「教科書或診所裡」會用的字 Teenager points to the -teen numbers (thirteen to nineteen)teenager指的是「-teen」那些數字（十三到十九歲） adolescent points to the growing-up processadolescent指的是成長發育的過程 so a very young twelve-year-old might still be called an adolescent所以即使是年紀很小的十二歲小孩，也可能被稱為adolescent。 In casual talk在日常口語裡 teenager is what people say大家會說teenager。

Though actually, when an adult calls another adult’s behaviour adolescent, they mean it as a slight: ‘you are acting like a sulky teen.’ The noun is older in English than the adjective; the adjective became common later.

Though actually不過其實 when an adult calls another adult's behaviour adolescent當一個大人說另一個大人的行為是adolescent時 they mean it as a slight通常帶有輕微的貶意 'you are acting like a sulky teen.'意思接近「你表現得像個鬧脾氣的青少年」 The noun is older in English than the adjective這個字的名詞用法在英文裡出現得比形容詞早 the adjective became common later形容詞用法是後來才普遍的。