In November the International energy Agency predicted that renewable energy would overtake natural gas to become the second largest source of power generation worldwide within two years.
11月，国际能源机构预测，在两年内，可再生能源将取代天然气成为世界第二大发电能源。
This question of second-generation infertility is an area of particular interest, and given the relative infancy of the science of IVF, it is something that will become clear only in years to come.
假设IVF这门科学还处在相对幼稚的时期，第二代不育的问题是一个非常让人感兴趣的领域，涉及的问题可能只有在未来几年才会清楚。
Digital reference service (DRS) has become the integral part of the second generation digital library.
数字参考咨询已成为第二代数字图书馆不可缺少的一部分。
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