心灵是一个可以在多个层次上分析的复杂系统。
Technological innovation is the primary driving force for the high-quality development of the natural gas industry.
宁可选择自由的贫困,也不愿选择奴隶般的富裕。
"Matching methods can be a powerful tool when randomization is not possible."
I've always been drawn to the underdog because I've always felt like the underdog.