When he was a child, he liked to find out how things worked.

当他还是个孩子时，就爱弄明白各种事物的来龙去脉。

youdao

When he was a child, he liked to find out how things worked.

当他还是个孩子时，就爱弄明白各种事物的来龙去脉。

youdao