下面段落构成的推展句是用的什么方法? There is nothing hard in the world for people with a strong will. A task, no matter how difficult, can be accomplished if a person makes up his mind to do it. Take Rome as an example. It is known that Rome was not built in a day. Before she was built, her founders had suffered a great deal of severe hardship, but they never lost their faith and eventually succeeded in their efforts. Columbus, who discovered America, is another example of strong determination. In spite of defeat and affliction, he went forward and succeeded because of his singleness of purpose and perseverance.