2. In the case of both the Moon and Mars. It is generally concluded from the appearance of their heavily cratered surfaces that they have been subjected to bombardment by large meteoroids during their geological history.
[结构简析] in the case of 就说,至于,论到。
[参考译文] 拿月亮和火星来说,一般都从它们表面严重的陨石坑得出结论:它们在其地质进化过程中遭到过巨大的陨星的撞击。
3. Two major difficulties inherent in this concept are the lack of any known sialic meteorites, and the high probability that the energy of impact would result in a wide dissemination of sialic material, rather than its concentration at the point of impact.
[结构简析] that clause 是high probability 的说明同位语。
[参考译文] 这一概念本身固有的两大难点是缺乏任何已知的硅铝陨石和下列现象的高概率:即撞击的能量会导致硅铝材料广泛分散,而不是集中于撞击点上。
写作方法与文章大意
文章一开始就说明了此文论述大陆核生成过程中大的陨星的撞击作用。由于地球表面地质进化抹去了大陆原始结构和组成的痕迹,只好由月亮和火星作为研究对象来说明地球。从三方面来论述:一是鲍德温的方程式,深度和宽度;二是硅铝组成;三是海洋盆地。最后结论。
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