这时，他开始详细说明他那“一千颗弹珠”的理论。

"And that's when he began to explain his theory of" a thousand marbles.

youdao

这时，他开始详细说明他那“一千颗弹珠”的理论。

"And that's when he began to explain his theory of" a thousand marbles.

youdao