从7、8岁时开始，我运营了这台机器四年许。

I ran the machine for about 4 years from the time I was 7 or 8.

youdao

从7、8岁时开始，我运营了这台机器四年许。

I ran the machine for about 4 years from the time I was 7 or 8.

youdao