【释义】：礼节重在相互回应。送出礼遇而对方不回应，这是不合礼数的；接受了别人的礼遇却不回报，同样也是不符合礼的要求。

Education is the foundation for building a sustainable relationship with the sea.

"Science is about understanding the world around us, and that understanding can lead to incredible advancements."

语言是存在的家。

超流理论是理论物理学中最美丽的篇章之一。