言而当，知也；默而当，亦知也。
言语得当，是智慧的表现；沉默得当，也是智的表现。
The energy sector must lead by example in the fight against climate change.
小说是一面镜子，不仅反映世界，也反映读者的灵魂。
The study of automorphic forms is a reflection of the unity of mathematical ideas.