Break off pieces of the red thread and tie a randomly chosen pair of buttons together by the thread.

用一段一段的红色的线段，把随机选择的钮扣，一对一对地连在一起。

youdao

Break off pieces of the red thread and tie a randomly chosen pair of buttons together by the thread.

用一段一段的红色的线段，把随机选择的钮扣，一对一对地连在一起。

youdao