因此，本世纪能源和矿物的实际价格已经下降了。

For this reason prices for energy and for minerals have fallen in real terms during the century.

youdao

我们必须替换数十亿使用矿物燃料的汽车。虽然技术上已经可行，但实际操作还是有困难。

We have to replace billions of cars which are running with fossil fuels. We are still not prepared for this even though the technology is here.

youdao

就像以前的西部原野那样，太阳系实际上地有无限的能源和矿物资源。

Just like in the old Wild West days, the solar system has practically limitless energy and mineral resources.

youdao