I think you're seventeen years old.
我猜你有十七岁了。
We are seventeen years old, but it's just last year.
我们的十七岁，好像不过才是去年的事。
He began to learn English letters when he was seventeen years old.
他在十七岁时开始学习英文字母。
I left school when I was seventeen years old, because my father was not rich.
因为父亲并不富有，我在十七岁时就辍学了。
I am Mark Huang, a second-year senior high school student. I am seventeen years old.
我是高中二年级的洪马克，年龄十七岁。
I am Mark Huang, a second-year senior high school student. I am seventeen years old.
我是高中二年级的洪马克，年龄十七岁。
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