n. (u.)不可數名詞輕少年時期;青年Rachel was a dancer in her youth, but she's too old now
n. (c./u.)名詞 (可數/不可數)青少年The youth of today know things I do not know even as an adult
n. (u.)不可數名詞青春時期I had a happy youth because we lived in the countryside
n. (c.)可數名詞青年Officer, I think the robber who entered my house was a white youth, maybe 15-16 years old