Through the design of trampling generating plant, let the children learn how electricity is flowing.

模拟发电厂的设计，让孩子们可以观察电流的流动方式。

youdao

Through the design of trampling generating plant, let the children learn how electricity is flowing.

模拟发电厂的设计，让孩子们可以观察电流的流动方式。

youdao