采石业必须与技术一起发展,否则就有落后的风险。
The process of grouping, of organization, is not arbitrary but follows definite laws.
当我不会演戏时,我被要求演戏。当我不会唱歌时,我被要求唱
The true cost of overfishing is measured in empty nets and broken communities.
发现现象原因或真实假设的艺术,如同破译的艺术,其中巧妙的猜想常缩短道路。