父母们奇怪为什么溪流是苦的，而他们自己却毒害了泉水。
Parents wonder why the streams are bitter, when they themselves have poisoned the fountain.
In science, the most exciting phrase to hear is not 'Eureka!' but 'That's funny...'
每个矿工的贡献对于保持灯火通明至关重要。
塑料行业必须进化，否则就会被淘汰——可持续性不再是可选项。