Natural experiments are a powerful tool for understanding causal relationships in the real world.

爱是宇宙中最强大的力量。

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.

我总是试图突破电影制作中可能的界限。

我不喜欢被束缚，因为音乐需要自由。