Intermediated fossil forms, predicted by gradualism, are typically lacking.

进化渐进论所预测的中间状态的化石一直缺乏。

youdao

Traditional forms of energy, i.e. fossil fuels have traditionally been cheaper to produce than alternative forms such as solar and wind.

FORBES: Which Candidate's Energy Plan is Better for America?

So when we pursue energy independence, when we continue to reduce our dependence on foreign oil by increasing domestic production of fossil fuel energy but other forms of energy, we enhance our security and protect America's future in that way.

WHITEHOUSE: Press Briefing

That should apply to everything from traditional fossil fuels to nuclear power to all forms of alternative energy.

FORBES: Magazine Article