I lost it when I was chasing a rabbit.

我在追兔子的时候把它弄丢了。

youdao

When I was 7 years old, one day I started chasing after a rabbit.

我七岁的时候，有一天我开始追赶野兔。

youdao

When I was 7 years old, one day I started chasing after a rabbit.

我七岁的时候，有一天我开始追赶野兔。

youdao