铁制锄头使土地更高产，铁制武器使战士更强大，它们在许多非洲西部的部落中都拥有象征性意义。
Iron hoes, which made the land more productive, and iron weapons, which made the warrior more powerful, had symbolic meaning in a number of West Africa societies.
正是历经生活中所有的起伏才使我们变得更强大。
It's emerging from all the ups and downs in life that makes us stronger.
明确地说，我们学习设计模式——设计我们程序的方法，使它们功能更强大、更灵活、更准确。
Specifically, we learn about design patterns — ways of designing our programs to make them more robust, flexible, and correct.
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