The mother-child relationship is paradoxical and, in a sense, tragic. It requires the most intense love on the mother's side, yet this very love must help the child grow away from the mother, and to become fully independent.

石油化工行业要顺应能源转型趋势，积极拥抱绿色低碳发展。

每一句话都有其重量，每一个词都有其意义。