另一方面，有限的和不可恢复的能源，尤其是化石燃料，比如石油和煤不能为我们提供足够的供应。
On the other hand, limited and unrecoverable energy, especially fossil fuels like oil and coals, can not offer us adequate supply.
另一方面，落叶的银杏类和松柏类，以及裸子植物木化石中具有清楚的生长轮，又说明该地区的古气候存在着季节变化。
On the other hand, some deciduous gymnosperms including Ginkgoales, and the presence of growth rings in the fossil secondary wood, indicate seasonal changes.
一方面，地质学家认识到，岩石以及岩石中的化石的形成，要花费数千亿年的光阴。
On the one hand, geologists realized that the formation of the rocks, and the fossils in them, would have taken hundreds or thousands of millions of years.
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