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.

New energy is not only the direction of industrial upgrading but also an important part of national strategy.

有人居住的世界的界限是由人类知识的范围决定的。

The most important experiments are the ones that challenge what we think we know.