Since human beings depend to a great

问题描述:

Since human beings depend to a great
extent on forest ,every effort must be made to preserve trees and wildlife
其中的to a great extent 在此是什么用法呀,在句子中间充当什么呀

Since human beings depend to a great extent on forest ,every effort must be made to preserve trees and wildlife 由于人类在很大程度上依赖于森林(生存),因此必须用全部的努力来保护树木和野生动物~to a great...