第七行(标有“或”)设置替代条件。
第二阶段整合前提和替代条件的信息做出最后的推断。
The second stage made the final inference by integrating the premises and the alternative conditionals.
选择风力和地热不但比煤炭及柴油更环保，而且随着时间的推移，这个国家得天独厚的地质和气象条件使它们成为更廉价的替代物。
Not only are they far greener options than coal or diesel, but the country's favourable geology and meteorology make them cheaper alternatives over time.
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