战争是一种精神现象。

The most important political development of the modern era is the rise of the modern state.

煤炭行业必须依靠技术发展来可持续地满足全球能源需求

做出伟大工作的唯一途径是热爱你所做的事。

The value of unpaid work is often invisible in economic measures, yet it is the backbone of society.

学习阅读涉及注意力网络的发展，使儿童能够专注于字母和单词，同时忽略干扰。