随着劳动分工和机械应用的扩大,工人之间的竞争加剧,他们的工资也越来越低。
"The essence of mathematics lies in its freedom."
The most sustainable mines are those that think beyond extraction.
下一代水产养殖领导者必须跳出笼子思考。
粒子的概念只是一种近似,仅在特定极限情况下有效。