You become a teenager at thirteen.

你在十三岁时，就是青少年。

youdao

How much energy did my father and I waste arguing about the length of my hair at thirteen?

我十三岁的时候我父亲和我浪费了多少精力来争论我头发应该多长？

youdao

At thirteen he had to leave school as his father suffered some losses and became poorer for a time.

十三岁时他被迫辍学，因为他父亲遭受了一些损失，一时穷了下来。

youdao

At the start of this year there were two hundred thirteen thousand cases of leprosy reported in one hundred twenty-one countries.

VOA: special.2009.10.14

Jim Lovell talked about the current situation at NASA during an event to mark the fortieth anniversary of Apollo Thirteen.

VOA: special.2010.04.28

Researchers from the Pew Charitable Trusts recently looked at how thirteen American cities are trying to balance budgets in a time of recession.

VOA: special.2009.07.13

At thirteen, he recalls, he was nabbed while robbing a Jordan Marsh department store. (He and his friends learned to hide out in stores at closing time, steal their merchandise, and then break out during the night.) The remainder of his childhood was spent mostly in the state reform school.

NEWYORKER: Hellhole

McNamara spent thirteen years at the bank, during which he increased its lending thirteen-fold, expanded its research department, and welcomed China as a member.

NEWYORKER: The Next Crusade

Shaped like a spinning top, it moves at more than thirteen thousand miles an hour.

NEWYORKER: The Martian Chroniclers