判断1 0简介：When Zhao Huai heard this, he was helpless. It was easy to generate electricity but difficult to use. The first thing he thought of as an insulating material was rubber, but there was no rubber-producing place on the continent.
When Zhao Huai heard this, he was helpless. It was easy to generate electricity but difficult to use. The first thing he thought of as an insulating material was rubber, but there was no rubber-producing place on the continent.
