和其它动物相比较,婴儿在出生以后,要有更长的一段霎时间需要别人的照顾。
技术变革不是外生的;它是人们对市场激励做出反应而采取的有意行动的结果。
Every challenge is an opportunity to learn and improve.
The sustainable development of the coal industry requires the coordinated efforts of policy, technology, and the market.
I think that the best films are those that are not easily categorized.