So the greenhouse gas forcings are precisely known.

所以科学家已精确地 掌握了温室气体强迫的状况。

" Ice has a wonderful archive of not only the climate, but also the forcings of climate, " the major causes of climate change, Thompson said.

" 冰不仅记录了气候，还记录了气候的强迫作用。" 气候变化的主要原因。