一种方案建议使用海绵石建造穹顶以减小穹顶自身重量。

One thought the dome should be made of "sponge stone" to keep the weight down.

youdao

一种方案建议使用海绵石建造穹顶以减小穹顶自身重量。

One thought the dome should be made of "sponge stone" to keep the weight down.

youdao