Progress in the development of renewables could be fragile, however, if fossil fuel prices remain low for long.
然而，如果化石燃料价格长期保持低位，可再生能源的发展进程可能会非常脆弱。
Many species appear to remain unchanged in the fossil record for millions of years—a situation that seems to be at odds with Darwin's model of continuous change.
许多物种似乎在数百万年的化石记录中都保持不变——而这种情况似乎与达尔文的持续变化模型不一致。
The report said that fossil fuels — especially from the major oil-exporting nations in the Mideast — will remain as the world's main energy source.
报告称，矿物燃料，特别是来自中东地区主要石油出口国家的矿物燃料，将继续成为世界的主要能源来源。
Global primary energy demand will remain overwhelmingly dominated by fossil fuels, with coal, oil and gas accounting for 82 percent in 2030 (currently 81 percent).
全球初级能源需求将继续以化石燃料为主，到2030年煤、石油和天然气将占82%(目前占81%)。
That any traces at all remain from so long ago is astounding, and anyway it is not the completeness of the fossil record but its consistency that matters.
这些延伸到过去的印迹令人震撼，虽然这些并不是全部的线索，但是重要在于化石记录着过去到现在的连带关系。
We are far from that point today: much-hyped technologies such as wind and solar energy remain very expensive and inefficient compared with cheap fossil fuels.
今天，我们离这个目标还远着：相对于便宜的化石燃料来说，大肆宣传的科技，如风能和太阳能，仍然是非常昂贵和低效的。
Trent acknowledges that challenges remain in figuring out the right algae strains, and in engineering the system to make algae biofuels a cost-effective alternative to existing fossil fuels.
特伦特承认，在塑料袋中计算出藻类合适的株数，以及在工程系统中使藻类作为一种可替代现有化石燃料的低成本燃料，具有一定的挑战性。
While they remain highly uncompetitive to fossil fuels, they have overtaken nuclear on a cost per kilowatt basis.
尽管和化石燃料相比它们还很不具备竞争优势，但基于每千瓦的成本计算，它们已比核能更占上风。
Fossil energy is the major energy of the world now. It will remain so in decades to come.
化石能源是当前世界的主要能源，几十年内仍将如此。
Demand is expected to remain strong driven mainly by increasing costs of fossil energies, societal sensitivity to environmental concerns and financial incentives in many countries.
在不可再生能源价格持续增长、全社会对环境问题关注度提高以及许多国家的财政鼓励政策推动下，可再生能源业务的需求预期将继续保持强劲。
But some plays remain intact in Puxian Opera, a ancient genre of drama in Fujian. Thus it is called the living fossil of the Southern Opera in the Song and Yuan Dynasties.
然而，在被誉为“宋元南戏活化石”的福建古老剧种莆仙戏中，却完整地保留了一批佚失已久的南戏剧目。
However, he says that on average, nearly half of all emissions from fossil fuel use and land-use changes remain in the atmosphere, with the rest being absorbed by the land and oceans.
然而，总的来说，由于使用陆地化石燃料的使用，会有将近一半的排泄物积存在大气中，余者则被陆地和海洋吸收。
However, he says that on average, nearly half of all emissions from fossil fuel use and land-use changes remain in the atmosphere, with the rest being absorbed by the land and oceans.
然而，总的来说，由于使用陆地化石燃料的使用，会有将近一半的排泄物积存在大气中，余者则被陆地和海洋吸收。
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