A room is not a room without natural light.
没有自然光的房间不是真正的房间。
A teacher who is attempting to teach without inspiring the pupil with a desire to learn is hammering on cold iron.
释义：能认清时代潮流的人才是俊杰，懂得随机应变的人方为英豪。
The arithmetic of algebraic groups is a key to understanding the Langlands conjectures.
Sustainable quarrying isn't an option; it's our obligation to future generations.
We are all strangers, even to ourselves.