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此两题答案无妨，有小小疑问，有关介词of的使用，请诸位nn赐教！
不胜感激涕零！ 在GWD29-2中 ...... is responsible for advancing studies of the flow of heat from the inner through the outer planet and of the formation and periodic reversal in direction of Earth’s magnetic field of用法为：studies of A and of B.... 在GWD29-26中：
......results from the combined gravitational pull of the Sun and all the other planets, each contributing according to its mass and distance from the others. 这里of用法为：gravitational pull of A and B...
如果换成：gravitational pull of A and of B...可以吗？
以上这两种用法都可以吗？哪种更好呢？thanks!!!
[此贴子已经被作者于2008-9-12 13:49:50编辑过] | 
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发表于 2008-9-12 13:45:00
