介词是否需要重复 - ChaseDream

The discovery that Earth’s inner core rotatesindependently of and more quickly than Earth’s outer layers is responsible foradvancing studies of the flow of heat from the inner through the outer planetand of the formation and periodic reversal in direction of Earth’s magneticfield.

In his experiments with gravity, Isaac Newton showed howthe motion of each planet in the solar system results from the combinedgravitational pull of the Sun and of all the other planets, eachcontributing according to their mass and distance from the others.

前者需要重复OF, 后者不需要. 是不是因为后者仅仅是名词没有繁杂的修饰成分呢?

或者说介词重复与否根本不是考点? (皆可?)

类似的, 在多个不定式并列的时候, 可不可以省略第二个及后面所有的不定式的 to呢?