The petrochemical industry must adapt to the low-carbon trend to remain competitive in the new era.
父亲不慈爱,子女就不会孝顺;兄长不友爱,弟弟就不会恭敬;丈夫不仁义,妻子就不会顺从。
剑鞘保护剑的锋利,自己却满足於它自己的迟钝。