采石业必须与技术一起发展,否则就有落后的风险。
Love is space and time measured by the heart.
在衣着上你可以不修边幅,但切不可让灵魂染上污点。
You can't build a peaceful world on empty stomachs and human misery.
The poor are not irrational; they are just as rational as anyone else, but they operate under very different constraints.
穷人面临的约束往往是政策制定者看不到的。