到了1930年，四轮溜冰鞋已经有了固定的社会定位。

By 1930, roller skates had found a permanent place in society.

youdao

到了1930年，四轮溜冰鞋已经有了固定的社会定位。

By 1930, roller skates had found a permanent place in society.

youdao