Humor is a powerful tool in children's books; it can make serious topics accessible.

The most important object of both the workmen and the management should be the training and development of each individual in the establishment, so that he can do (at his fastest pace and with the maximum of efficiency) the highest class of work for which his natural abilities fit him.

拓扑学是对图形在任何变形下保持不变的性质的研究。

I'm not a victim, I'm a fighter.

诗歌是人类种族的母语。