The stone have is wear smooth by the constant flow of water.

这些石头不断经流水冲刷已很光滑。

youdao

I flow a stone to the snake. It break behind the snake.

我向蛇扔了一块石头，石头砸到了蛇的背后。

youdao

I flow a stone to the snake. It break behind the snake.

我向蛇扔了一块石头，石头砸到了蛇的背后。

youdao