We have a responsibility to future generations to leave the planet in better shape than we found it.
我们有责任为子孙后代留下一个比我们发现时更好的地球。
Mathematics is not a spectator sport. You have to get involved.
幸福是最近两年里听到最多的词语。幸福不单只是和个人经历和价值相关,它也同样关系到我们的环境。