I am twelve years old and have had over four hundred children.

我十二岁了，有超过四百个孩子。

youdao

When I was about four years old I had traveled by train.

大约在我四岁多的时候，我坐过火车。

youdao

When I was about four years old I had traveled by train.

大约在我四岁多的时候，我坐过火车。

youdao