第1个回答 2012-11-16
Professor I’d like to take you back about 11 thousand years ago when Earth entered the latest interglacial period. Interglacial periods are, typically periods of time between Ice Ages, when the climate warms, and the glacial ice retreats for a time, before things cool off again and another Ice Age begins. And for over the past several million years, Earth’s sort of default climate has actually been Ice Age, but we have experienced periodic regular thaws, and the last one, the one we are in now, started about 11 thousand years ago.
答:我认为这里的for与over是重复使用。用其中的任何一个都可以:
For the past several million years, Earth’s sort of default climate has actually been Ice Age
Over the past several million years, Earth’s sort of default climate has actually been Ice Age
介词over还可以改为In, during
In/During/Over/For the past/last several million/ 50/ thousand/... years, 作时间状语,主句谓语用现在完成时。
见过双介词from behind, in between 吗? 我认为这属于双介词,相当于for and over 的省略and
for与over后跟一段时间,其实还是有一点差别的。for可以说是一条直线,over是一条弧线。for ten years, ------------>, over ten years, ...;;;;;;''''''````;;;;;;;......> 象一条平抛线那样的,有跨越之意。