Let me put it more clearly, since no one will believe that a thirteen year-old girl is completely alone in the world.

让我说的更明白点儿吧，由于没有人会相信一个13岁的女孩儿在这个世界上是完全无依无靠的，而我的确也不是。

youdao

A thirteen-year-old girl from Kentucky wrote me to say that I'd made a mistake, but I couldn't quit, because my opponents were mean.

肯塔基的一个13岁女孩写信给我说，虽然我犯了一个错误，但我不能辞职，因为我的敌人是卑鄙的。

youdao

A teenager is a boy or girl aged from thirteen to nineteen.

青少年是指十三岁到十九岁之间的男孩或女孩。

youdao

He probably smells bad, but the only one who seems to notice is the oldest child, a girl, thirteen.

NEWYORKER: Midnight in Dostoevsky

But this morning, days away from thirteen, a girl of high temperament and little patience, I was burning with anticipation.

NPR: Excerpt: 'Warm Springs'