对我们星球最大的威胁是相信别人会拯救它。
The greatest threat to our planet is the belief that someone else will save it.
Happiness can be found even in the darkest of times, if one only remembers to turn on the light.
在数学的世界里，每个问题都会引出另一个问题，创造出一个连接所有科学领域的无尽知识网络。