She can't be only thirteen.

她不可能只有十三岁。

youdao

In 1921, when she was only thirteen years old, a movie director saw her in the street.

1921年，当她只有13岁时，一个电影导演在街上看到了她。

youdao

Stafford and Cernan flew the lander down to only thirteen kilometers from the moon.

VOA: special.2009.07.08

which you'll think, only a ten or eleven year old, but when there is thirteen of them, it's a lot.

你会想，不就是十岁、十一岁的小孩嘛，但有十三个还是很多的。

大城市是否危险？ - SpeakingMax英语口语达人

In comparison, only thirteen percent of the monkeys on restricted diets had died.

VOA: special.2009.09.01

Each group was in limited contact with the others: at the time, only thirteen per cent of East Germans even had a phone.

NEWYORKER: Small Change

Jahangir, who was only thirteen at the time, was alone in the house with her two sisters, and had to take the badly wounded man to the hospital.

NEWYORKER: Days of Rage

After Gertrude's death, the dynasty she had put in place continued for thirty-two more years, while Europe plunged into war again after only thirteen, dragging the rest of the world with it.

NPR: Excerpt: 'Gertrude Bell'