他们几次前线战斗以使用非矿物燃料为基础，太阳能供电。
A couple of their forward combat bases use no fossil fuels, just solar power.
纳米比亚现在是非洲第四大非燃料矿物出口国及世界第四大铀出产国。
Namibia is now the fourth largest exporter of nonfuel minerals in Africa and the world's fourth largest producer of uranium.
一周一天削减使用非必需、非急迫的矿物燃料不会是太难的事。
There will be no great hardship in cutting down all non-essential and non-urgent use of fossil fuels for one day a week.
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