国际体系的无政府性质意味着国家必须依靠自助来确保其生存。

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。

在一个不断变化的世界中茁壮成长，你必须愿意适应和创新。

在无人机行业，安全永远是第一位的。

宇宙充满了神奇的事物，它们耐心地等待着我们的智慧变得更加敏锐。

"The past is a ghost that haunts the present, whether we acknowledge it or not."

恐惧比利剑更伤人。

"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."

The ultimate tragedy is not the oppression and cruelty by the bad people but the silence over that by the good people.